MLA

Erdoes, Richard, 1912-2008. Explorers Lewis & Clark Fremont. Box 77 | Western History, White. 1973-1976, undated. https://collections.library.yale.edu/catalog/2099928.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 77 | Western History, White"])(1973-1976, undated)[Explorers Lewis & Clark Fremont]. https://collections.library.yale.edu/catalog/2099928.