MLA

A Scene at the New Theatre Covent Garden [Graphic]. Publish'd Aprill [the] 16, 1784, by J. Wallis, No. 16 Ludgate, 0AD. https://collections.library.yale.edu/catalog/10727785.

APA, 6th edition

A scene at the New Theatre Covent Garden [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1784, Etchings England London 1784]. Publish'd Aprill [the] 16, 1784, by J. Wallis, No. 16 Ludgate. https://collections.library.yale.edu/catalog/10727785.