MLA

Steinberg, Saul, 1914-1999. Erotic photographs. Box 182, folder 3382-3385. undated. https://collections.library.yale.edu/catalog/2016724.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 182, folder 3382-3385"])(undated)[Erotic photographs]. https://collections.library.yale.edu/catalog/2016724.