MLA

How Very Blue the Candle Burns!! [Graphic]. Pub. July 30, 1796, by S.W. Fores, No. 50 Piccadilly, 0AD. https://collections.library.yale.edu/catalog/10952947.

APA, 6th edition

How very blue the candle burns!! [graphic]. (0 C.E.). [Satires (Visual works) England 1796, Etchings England London 1796, Watermarks (Paper) J Whatman 1794, Booksellers' stamps (Provenance) S. W. Fores]. Pub. July 30, 1796, by S.W. Fores, No. 50 Piccadilly. https://collections.library.yale.edu/catalog/10952947.