MLA

Gillray, James, 1756-1815, printmaker. "Two pair of portraits" presented to all the unbiased electors of Great Britain by John Horne Tooke / [graphic]. [between 1824 and 1827]. https://collections.library.yale.edu/catalog/10941260.

APA, 6th edition

Gillray, James, 1756-1815, printmaker. ([between 1824 and 1827])["Two pair of portraits" presented to all the unbiased electors of Great Britain by John Horne Tooke / [graphic]]. https://collections.library.yale.edu/catalog/10941260.