Cite

(two males nudes, one against tree, one in background)

MLA

Giard, Robert. (Two Males Nudes, One against Tree, One in Background). 0AD. https://collections.library.yale.edu/catalog/2034832.

APA, 6th edition

Giard, R. (0 C.E.). (two males nudes, one against tree, one in background). https://collections.library.yale.edu/catalog/2034832.