MLA

Kilpatrick, Jack Frederick (1915-1967). Standingdeer, David (Dewi Awigadoga). Letter to Uwedasadi (John Campbell). Box 11, folder 990. 1923 December 7. https://collections.library.yale.edu/catalog/15493795.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 11, folder 990"])(1923 December 7)[Standingdeer, David (Dewi Awigadoga). Letter to Uwedasadi (John Campbell)]. https://collections.library.yale.edu/catalog/15493795.