MLA

Steinberg, Saul, 1914-1999. Untitled [Photocopy of man on bicycle and two peasant women in front of store]. Box 461, folder 6392. undated. https://collections.library.yale.edu/catalog/16854945.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 461, folder 6392"])(undated)[Untitled [Photocopy of man on bicycle and two peasant women in front of store]]. https://collections.library.yale.edu/catalog/16854945.