Cite

(two male nudes on sofa, one covered by blanket)

MLA

Giard, Robert. (Two Male Nudes on Sofa, One Covered by Blanket). 0AD. https://collections.library.yale.edu/catalog/2034889.

APA, 6th edition

Giard, R. (0 C.E.). (two male nudes on sofa, one covered by blanket). https://collections.library.yale.edu/catalog/2034889.