MLA

Humorous Sketches of Skeletons Engaged in the Various Sciences / [Graphic]. Published 3rd June 1830 by S. Gans, 15, Southampton Street, Strand, 0AD. https://collections.library.yale.edu/catalog/15808767.

APA, 6th edition

Humorous sketches of skeletons engaged in the various sciences / [graphic]. (0 C.E.). [Etchings England London 1830, Watermarks (Paper)]. Published 3rd June 1830 by S. Gans, 15, Southampton Street, Strand. https://collections.library.yale.edu/catalog/15808767.