MLA

Blyth, Robert, 1750-1784, printmaker, publisher. The Right Honourable Thomas Alexander Erskine Earl of Kellie, Viscount Fenton, Baron of Dirleton, &c. &c. &c. / [graphic]. [12 February 1782]. https://collections.library.yale.edu/catalog/33191958.

APA, 6th edition

Blyth, Robert, 1750-1784, printmaker, publisher. ([12 February 1782])[The Right Honourable Thomas Alexander Erskine Earl of Kellie, Viscount Fenton, Baron of Dirleton, &c. &c. &c. / [graphic]]. https://collections.library.yale.edu/catalog/33191958.