MLA

The Inflexible Porter a Tragedy / [Graphic]. Pub. by S.W. Fores, 41 Piccadilly, 0AD. https://collections.library.yale.edu/catalog/15813498.

APA, 6th edition

The inflexible porter a tragedy / [graphic]. (0 C.E.). [Satires (Visual works) England 1783, Etchings England London 1820, Crayon manner prints England London 1820]. Pub. by S.W. Fores, 41 Piccadilly. https://collections.library.yale.edu/catalog/15813498.