MLA

Collings, Samuel, and printmaker. Protheus on Privileges [Graphic]. Published as the act directs, by Bentley & Co., 0AD. https://collections.library.yale.edu/catalog/10732527.

APA, 6th edition

Collings, S., & printmaker. (0 C.E.). Protheus on privileges [graphic] [Caricatures and cartoons, Satires (Visual works) England 1791, Periodical illustrations, Stipple engravings England London 1791, Etchings England London 1791]. Published as the act directs, by Bentley & Co. https://collections.library.yale.edu/catalog/10732527.