MLA

Sam Spot Esqr. [Graphic]. Pub. July 1, 1778 by M Darly 39 Strand, 0AD. https://collections.library.yale.edu/catalog/10723196.

APA, 6th edition

Sam Spot Esqr. [graphic]. (0 C.E.). [Etchings England London 1778, Engravings England London 1778, Satires (Visual works) England 1778]. Pub. July 1, 1778 by M Darly 39 Strand. https://collections.library.yale.edu/catalog/10723196.