MLA

Erdoes, Richard, 1912-2008. Circus Military. Box 77 | Western History, White. 1975-1976, undated. https://collections.library.yale.edu/catalog/2099454.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 77 | Western History, White"])(1975-1976, undated)[Circus Military]. https://collections.library.yale.edu/catalog/2099454.