Cite

[Portrait of William Murray, Earl of Mansfield] [graphic].

MLA

[Portrait of William Murray, Earl of Mansfield] [Graphic]. publisher not identified, 0AD. https://collections.library.yale.edu/catalog/16193416.

APA, 6th edition

[Portrait of William Murray, Earl of Mansfield] [graphic]. (0 C.E.). [Portrait prints, Etchings England London 1770, Engravings England London 1770]. publisher not identified. https://collections.library.yale.edu/catalog/16193416.