MLA

Erdoes, Richard, 1912-2008. Fts. Chadron Robinson + Laramie. Box 87 | South Dakota: Badlands, Black Hills, Forts, Saloons, Landscapes, Etc.. 1980-1991, undated. https://collections.library.yale.edu/catalog/2106930.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 87 | South Dakota: Badlands, Black Hills, Forts, Saloons, Landscapes, Etc."])(1980-1991, undated)[Fts. Chadron Robinson + Laramie]. https://collections.library.yale.edu/catalog/2106930.