Cite

Both of these men had syphilis he took his syphilis shots every week until cured, he didn't take his shots / [graphic]

MLA

Karsakov, Leonard, and artist. Both of These Men Had Syphilis He Took His Syphilis Shots Every Week until Cured, He Didn't Take His Shots / [Graphic]. Venereal Disease Education Institute, 0AD. https://collections.library.yale.edu/catalog/16049094.

APA, 6th edition

Karsakov, L., & artist. (0 C.E.). Both of these men had syphilis he took his syphilis shots every week until cured, he didn't take his shots / [graphic] [Posters, Offset lithographs]. Venereal Disease Education Institute. https://collections.library.yale.edu/catalog/16049094.