MLA

Bartolozzi, Francesco, 1727-1815, printmaker, publisher. [Portrait of Lady Diana Beauclerk's daughters sitting on a bench] [graphic]. [15 May 1780]. https://collections.library.yale.edu/catalog/16729677.

APA, 6th edition

Bartolozzi, Francesco, 1727-1815, printmaker, publisher. ([15 May 1780])[[Portrait of Lady Diana Beauclerk's daughters sitting on a bench] [graphic]]. https://collections.library.yale.edu/catalog/16729677.