Cite

Humpty Dumpty sat on a wall, Humpty Dumpty had a great fall [graphic]

MLA

Dighton, Richard, 1795-1880, printmaker. Humpty Dumpty sat on a wall, Humpty Dumpty had a great fall [graphic]. Septr. 19, 1821.. https://collections.library.yale.edu/catalog/33245914.

APA, 6th edition

Dighton, Richard, 1795-1880, printmaker. (Septr. 19, 1821.)[Humpty Dumpty sat on a wall, Humpty Dumpty had a great fall [graphic]]. https://collections.library.yale.edu/catalog/33245914.