MLA

Haring, Keith, and artist. Crack down! [Graphic]. Keith Haring, 0AD. https://collections.library.yale.edu/catalog/16049174.

APA, 6th edition

Haring, K., & artist. (0 C.E.). Crack down! [graphic] [Offset lithographs, Posters]. Keith Haring. https://collections.library.yale.edu/catalog/16049174.