Nixon's the one [graphic].
MLA
Roseman, Shelly, and photographer. Nixon's the One [Graphic]. © 1968 Poster Prints, Box 526, Norristown, PA. 19404, 0AD. https://collections.library.yale.edu/catalog/16049146.
APA, 6th edition
Roseman, S., & photographer. (0 C.E.). Nixon's the one [graphic]. [Photomechanical prints, Posters, Protest posters, Satires (Visual works)]. © 1968 Poster Prints, Box 526, Norristown, PA. 19404. https://collections.library.yale.edu/catalog/16049146.