Many sources are against both systematic use and systematic avoidance of the serial comma, making recommendations in a more nuanced way as reflected in recommendations by style guides.
Omitting the serial comma may create ambiguity; writers who normally avoid the comma often use one to avoid this. Consider the apocryphal book dedication below:
There is ambiguity about the writer's parentage as "Mother Teresa and the pope" can be read as an appositive phrase renaming of my parents, leading the reader to believe that the writer claims that Mother Teresa and the pope are their parents. A comma before the and removes the ambiguity:
Nevertheless, lists can also be written in other ways that eliminate the ambiguity without introducing the serial comma, such as by changing the word order, or by using other or no punctuation to introduce or delimit them (though the emphasis may thereby be changed):
A serial comma following "Kris Kristofferson" would help prevent this being understood as Kris Kristofferson and Robert Duvall being the ex-wives in question.
In some circumstances, using the serial comma can create ambiguity. If the book dedication above is changed to
leaves the possibility that Betty is both a maid and a cook (with "a maid and a cook" read as an appositive phrase). In this case, neither the serial-comma style—nor the no-serial-comma style—resolves the ambiguity. A writer who intends a list of three distinct people (Betty, maid, cook) may create an ambiguous sentence, regardless of whether the serial comma is adopted. Furthermore, if the reader is unaware of which convention is being used, both styles can be ambiguous in cases such as this.
Ambiguities can often be resolved by the selective use of semicolons instead of commas when more separation is required. General practice across style guides involves using semicolons when individual items have their own punctuation or coordinating conjunctions, but typically a "serial semicolon" is required.
Omitting a serial comma is often characterized as a journalistic style of writing, as contrasted with a more academic or formal style. Journalists typically do not use the comma, possibly for economy of space. In Australia and Canada, the comma is typically avoided in non-academic publications unless its absence produces ambiguity.
It is important that the serial comma's usage within a document be consistent; inconsistent usage can seem unprofessional.
The opinion in the case said that 43 of the 50 U.S. states had mandated the use of a serial comma and that both chambers of the federal congress had warned against omitting it, in the words of the U.S. House Legislative Counsel's Manual on Drafting Style, "to prevent any misreading that the last item is part of the preceding one"; only seven states "either do not require or expressly prohibited the use of the serial comma".
Garner, Bryan A. (2016). Garner's Modern English Usage. Oxford University Press. p. 748. ISBN 978-0-19-049148-2. 978-0-19-049148-2
Upadhyay, Abhishek. "Serial comma - Oxford comma - Harvard comma". Writers' Mentor. Archived from the original on January 16, 2019. Retrieved January 15, 2019. https://web.archive.org/web/20190116041247/https://writersmentor.com/oxford-comma-necessary-serial-comma-harvard-comma/
The terms Oxford comma and Harvard comma come from Oxford University Press and Harvard University Press, where serial-comma use is the house style. /wiki/Oxford_University_Press
Sometimes, the term also denotes the comma that might come before etc. at the end of a list (see the Australian Government Publishing Service's Style Manual for Authors, Editors, and Printers, below). Such an extension is reasonable, since etc. is the abbreviation of the Latin phrase et cetera (lit. 'and other things').
The serial comma sometimes refers to any of the separator commas in a list, but this is a rare, old-fashioned usage. Herein, the term is used only as defined above.
Adams, Kenneth A. (2013). A Manual of Style for Contract Drafting (3rd ed.). American Bar Association. 12.61. ISBN 978-1-61438-803-6. 978-1-61438-803-6
McArthur, Tom (1998). "Comma". Encyclopedia.com. Concise Oxford Companion to the English Language. Archived from the original on August 31, 2024. Retrieved March 18, 2024. https://www.encyclopedia.com/humanities/encyclopedias-almanacs-transcripts-and-maps/comma
Gramlich, Andy (2005). "Commas: the biggest little quirks in the English language" (PDF). Hohonu. 3 (3): 71. Archived (PDF) from the original on August 7, 2020. Retrieved December 17, 2013. It's just a matter of STYLE, and in this case, newspaper or literary (book) style. . . . Choose one style or the other the authorities say, but be consistent. Most writers recommend the literary style in college writing to avoid possible confusion . . . https://hilo.hawaii.edu/campuscenter/hohonu/volumes/documents/Vol03x16Commas.pdf
Reimink, Troy (February 16, 2018). "The Oxford comma is an abomination, but it's now the law". The Traverse City Record-Eagle. Archived from the original on February 16, 2018. Retrieved March 3, 2018. http://www.record-eagle.com/news/local_news/troy-reimink-the-oxford-comma-is-an-abomination-but-it/article_53963e17-3238-5579-a5af-78b833c223fa.html
Reimink, Troy (February 16, 2018). "The Oxford comma is an abomination, but it's now the law". The Traverse City Record-Eagle. Archived from the original on February 16, 2018. Retrieved March 3, 2018. http://www.record-eagle.com/news/local_news/troy-reimink-the-oxford-comma-is-an-abomination-but-it/article_53963e17-3238-5579-a5af-78b833c223fa.html
Bryan A. Garner (2003). Garner's Modern American Usage. New York: Oxford University Press. p. 654. ISBN 0-19-516191-2. 0-19-516191-2
Lubin, Gus (September 20, 2013). "The Oxford Comma Is Extremely Overrated". Business Insider. Archived from the original on March 4, 2018. Retrieved March 3, 2018. http://www.businessinsider.com/do-you-need-the-oxford-comma-2013-9
The Economist Style Guide (10th ed.). Profile Books. 2012. pp. 152–153. ISBN 978-1-84668-606-1. Most American writers and publishers use the serial comma; most British writers and publishers use the serial comma only when necessary to avoid ambiguity ... 978-1-84668-606-1
The Oxford Style Manual, 2002: "The presence or lack of a comma before and or or ... has become the subject of much spirited debate. For a century it has been part of OUP style ..., to the extent that the convention has come to be called the 'Oxford comma'. But it is commonly used by many other publishers here and abroad, and forms a routine part of style in US and Canadian English" (p. 121).
Truss, Lynn (2004). Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation. New York: Gotham Books. p. 84. ISBN 1-59240-087-6. 1-59240-087-6
David Becker. "Using Serial Commas". APA. Archived from the original on October 19, 2014. Retrieved October 14, 2014. http://blog.apastyle.org/apastyle/2011/04/using-serial-commas.html
Garner, Bryan A. (2009). Garner's Modern American Usage (3rd ed.). Oxford University Press. p. 676. ISBN 978-0-19-538275-4. ... omitting the final comma may cause ambiguities, whereas including it never will ... 978-0-19-538275-4
Strunk, William Jr.; White, E. B. (2005). The Elements of Style. Illustrated by Maira Kalman (Illustrated ed.). Penguin Press. p. 3. ISBN 9-7815-9420-069-4. In a series of three or more terms with a single conjunction, use a comma after each term except the last. 9-7815-9420-069-4
"GPO Style Manual" (PDF). United States Government Publishing Office. 2016. pp. 201–202. Archived (PDF) from the original on July 29, 2018. Retrieved January 10, 2023. The comma is used ... after each member within a series of three or more words, phrases, letters, or figures used with and, or, or nor. https://www.govinfo.gov/content/pkg/GPO-STYLEMANUAL-2016/pdf/GPO-STYLEMANUAL-2016.pdf
The Oxford Style Manual, 2002: "The presence or lack of a comma before and or or ... has become the subject of much spirited debate. For a century it has been part of OUP style ..., to the extent that the convention has come to be called the 'Oxford comma'. But it is commonly used by many other publishers here and abroad, and forms a routine part of style in US and Canadian English" (p. 121).
Jordan Lewis (1962). The New York Times Style Book for Writers and Editors. McGraw Hill. https://archive.org/details/newyorktimesstyl00newy/page/30/mode/2up
The Economist Style Guide (10th ed.). Profile Books. 2012. pp. 152–153. ISBN 978-1-84668-606-1. Most American writers and publishers use the serial comma; most British writers and publishers use the serial comma only when necessary to avoid ambiguity ... 978-1-84668-606-1
"University of Oxford Style Guide" (PDF). p. 13. Archived (PDF) from the original on October 9, 2022. Retrieved June 17, 2021. Note that there is no comma between the penultimate item in a list and 'and'/'or', unless required to prevent ambiguity – this is sometimes referred to as the 'Oxford comma'. https://www.ox.ac.uk/sites/files/oxford/media_wysiwyg/University%20of%20Oxford%20Style%20Guide.pdf
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The Oxford Style Manual, 2002: "But it is commonly used by many other publishers here and abroad, and forms a routine part of style in US and Canadian English" (p. 121).
The Oxford Style Manual, 2002; from discussion of the serial comma: "The last comma serves also to resolve ambiguity, particularly when any of the items are compound terms joined by a conjunction" (p. 122).
Petelin, Roslyn (March 21, 2017), The case of the $13 million comma and why grammarians are rejoicing, Australia: ABC News, archived from the original on February 15, 2018, retrieved March 3, 2018 http://www.abc.net.au/news/2017-03-21/the-case-of-the-$13-million-comma/8372956
U.S. House Legislative Counsel's Manual on Drafting Style, No. HLC 104-1, § 351 at 58 (1995)
The Oxford Style Manual, 2002; in discussion of the semicolon, examples are given in which complex listed items are separated by semicolons, with the same structure and on the same principles as are consistently recommended for use of the comma as a list separator in the preceding section (pp. 124–5)
Ridout, R., and Witting, C., The Facts of English, Pan, 1973, p. 79: "Usually in such lists 'and' is not preceded by a comma, […]".
Based on example quoted in Victor, Daniel (March 16, 2017). "Lack of Oxford Comma Could Cost Maine Company Millions in Overtime Dispute". The New York Times. Archived from the original on March 17, 2017. Retrieved March 17, 2017. https://www.nytimes.com/2017/03/16/us/oxford-comma-lawsuit.html?_r=0
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