MLA

Signor Puppy First Catgut Scraper. [Graphic]. [Pu]bd. Nov. 27, 81, by H. Humphrey, No. 18 New Bond Street, 0AD. https://collections.library.yale.edu/catalog/10723527.

APA, 6th edition

Signor Puppy first catgut scraper. [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1781, Portrait prints, Etchings England London 1781]. [Pu]bd. Nov. 27, 81, by H. Humphrey, No. 18 New Bond Street. https://collections.library.yale.edu/catalog/10723527.