MLA

Wolves in Sheeps Cloathing [Graphic]. Pubd. 23 May, 1777 by W. Humphrey, Gerrard Street, Soho, 0AD. https://collections.library.yale.edu/catalog/10723111.

APA, 6th edition

Wolves in sheeps cloathing [graphic]. (0 C.E.). [Etchings England London 1777]. Pubd. 23 May, 1777 by W. Humphrey, Gerrard Street, Soho. https://collections.library.yale.edu/catalog/10723111.