MLA

Henry Cary, Lord Falkland from an Original Picture by Vansomer at Strawberry Hill. [Graphic]. Pub. Feby. 1, 1807, by J. Scott, No. 442 Strand, 0AD. https://collections.library.yale.edu/catalog/16229195.

APA, 6th edition

Henry Cary, Lord Falkland from an original picture by Vansomer at Strawberry Hill. [graphic]. (0 C.E.). [Portrait prints, Stipple engravings England London 1807]. Pub. Feby. 1, 1807, by J. Scott, No. 442 Strand. https://collections.library.yale.edu/catalog/16229195.