The UNESCO report cites an earlier (2005) edition of the Ethnologue as its own source for this particular data. The UNESCO report remains a useful independent source and benchmark year because of its wider availability. Footnotes do warn that the precise numbers should be used with some skepticism.
Greenberg, Joseph H. (1956). "The Measurement of Linguistic Diversity". Language. 32 (1): 109–115. doi:10.2307/410659. JSTOR 410659. /wiki/Doi_(identifier) ↩
Harmon, David; Loh, Jonathan (2010). "The Index of Linguistic Diversity: A New Quantitative Measure of Trends in the Status of the World's Languages" (PDF). Language Documentation and Conservation. 4. nflrc.hawaii.edu/ldc: 97–151. hdl:10125/4474. http://scholarspace.manoa.hawaii.edu/bitstream/handle/10125/4474/harmonloh.pdf ↩
"Summary by country". Ethnologue. 1999-02-19. Retrieved 2013-09-05. http://www.ethnologue.com/ethno_docs/distribution.asp?by=country ↩
Harmon, David; Loh, Jonathan (2010). "The Index of Linguistic Diversity: A New Quantitative Measure of Trends in the Status of the World's Languages" (PDF). Language Documentation and Conservation. 4. nflrc.hawaii.edu/ldc: 106–107. hdl:10125/4474. http://scholarspace.manoa.hawaii.edu/bitstream/handle/10125/4474/harmonloh.pdf ↩
"overview of Linguistic Diversity". terralingua.org. Archived from the original on 2013-05-21. Retrieved 2014-11-18. https://web.archive.org/web/20130521035957/http://www.terralingua.org/linguisticdiversity/overview/ ↩
Data published in Ethnologue: Languages of the World, Twentieth Edition. Summary by Country | Ethnologue, SIL International. Accessed on 13 October 2017. /wiki/Ethnologue ↩
UNESCO World Report – Investing in Cultural Diversity and Intercultural Dialogue /wiki/UNESCO ↩
Including New Caledonia, a French Overseas Territory with a high level of Linguistic Diversity Index /wiki/Languages_of_New_Caledonia#The_linguistic_situation_of_New_Caledonia_in_the_present_day ↩