MLA

[Sailors at Rest] from a Sketch Taken at Portsmouth by W.H. Bunbury Esqr. [Graphic]. Publish'd June 24th, 1785, by J.R. Smith, No. 83 Oxford Street, 0AD. https://collections.library.yale.edu/catalog/17355531.

APA, 6th edition

[Sailors at rest] from a sketch taken at Portsmouth by W.H. Bunbury Esqr. [graphic]. (0 C.E.). [Genre prints, Stipple engravings England London 1785, Etchings England London 1785, Engravings England London 1785]. Publish'd June 24th, 1785, by J.R. Smith, No. 83 Oxford Street. https://collections.library.yale.edu/catalog/17355531.