Untracht, Oppi (1968). Metal Techniques for Craftsmen. Doubleday. p. 18. ISBN 0-7091-0723-4. 0-7091-0723-4
War Office (1904) Dress Regulations for the Officers of the Army (Including the Militia). London: HMSO. p. 4 /wiki/HMSO
"105mm Advanced Cannon Artillery Ammunition Program (ACA2P) § 155mm M107". Archived from the original on 7 March 2007. https://web.archive.org/web/20070307111507/http://www.gd-ots.com/sitepages/artillery.html
Untracht, Oppi (1968). Metal Techniques for Craftsmen. Doubleday. p. 18. ISBN 0-7091-0723-4. 0-7091-0723-4
"1943 Steel Cent | Lincoln Steel Penny". 8 August 2009. Retrieved 2019-04-23. https://lincolncents.net/1943-lincoln-steel-cent/
"How much are Olympic medals worth?". CNN. 31 July 2021. Retrieved 2021-08-01. https://www.cnn.com/2021/07/31/sport/olympic-medals-value-explainer-scli-intl/index.html
Untracht, p. 49–50 - Untracht, Oppi (1968). Metal Techniques for Craftsmen. Doubleday. p. 18. ISBN 0-7091-0723-4.
Untracht, p. 246 - Untracht, Oppi (1968). Metal Techniques for Craftsmen. Doubleday. p. 18. ISBN 0-7091-0723-4.