MLA

A Stranger at Sparta Standing Long upon One Leg ... [Graphic]. Published 2st [sic] April 1781 by Torre, No. 44 Market Lane, 0AD. https://collections.library.yale.edu/catalog/11861429.

APA, 6th edition

A stranger at Sparta standing long upon one leg ... [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1781, Etchings England London 1781, Stipple engravings England London 1781, Aquatints England London 1781]. Published 2st [sic] April 1781 by Torre, No. 44 Market Lane. https://collections.library.yale.edu/catalog/11861429.