MLA

Marks, John Lewis, and printmaker. The Great Milan Leech [Graphic]. Printed and published by W. Benbow, 269 Strand, 0AD. https://collections.library.yale.edu/catalog/33245722.

APA, 6th edition

Marks, J. L., & printmaker. (0 C.E.). The great Milan leech [graphic] [Caricatures and cartoons, Satires (Visual works) England 1820, Etchings England London 1820, Broadsides 1820, Annotations (Provenance) 19th century]. Printed and published by W. Benbow, 269 Strand. https://collections.library.yale.edu/catalog/33245722.