MLA

A Letter from a Great Man's Butler [Graphic]. Pub. by E. Hedges N 92 Cornhill, 0AD. https://collections.library.yale.edu/catalog/10723520.

APA, 6th edition

A letter from a great man's butler [graphic]. (0 C.E.). [Satires (Visual works) England 1781, Engravings England London 1781, Etchings England London 1781]. Pub. by E. Hedges N 92 Cornhill. https://collections.library.yale.edu/catalog/10723520.