MLA

McClintock, Walter, 1870-1949. 204. [Siksikaikoan (Little Blackfoot)/William Jackson and Walter McClintock's camp in the Rocky Mountains.]. Box 61, folder 3032. 1938. https://collections.library.yale.edu/catalog/2008477.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 61, folder 3032"])(1938)[204. [Siksikaikoan (Little Blackfoot)/William Jackson and Walter McClintock's camp in the Rocky Mountains.]]. https://collections.library.yale.edu/catalog/2008477.