Cite

Untitled [Two horses with riders]

MLA

Steinberg, Saul, 1914-1999. Untitled [Two horses with riders]. Box 375, folder 5066. undated. https://collections.library.yale.edu/catalog/16854837.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 375, folder 5066"])(undated)[Untitled [Two horses with riders]]. https://collections.library.yale.edu/catalog/16854837.