MLA

Watson, Thomas, 1750-1781, printmaker, publisher. Princess Sophia Matilda, daughter to their Royal Highnesses the Duke and Duchess of Gloucester [graphic]. [1 January 1775]. https://collections.library.yale.edu/catalog/16729690.

APA, 6th edition

Watson, Thomas, 1750-1781, printmaker, publisher. ([1 January 1775])[Princess Sophia Matilda, daughter to their Royal Highnesses the Duke and Duchess of Gloucester [graphic]]. https://collections.library.yale.edu/catalog/16729690.