MLA

Watson, James, 1740-1790, printmaker. Reverendus Admodum Carolus Lyttelton Nuper Episcopus Carliolensis et Societatis Anitquariorum Praeses honoris & gratitudinis ergo voluit Soc. Ant. Lond. 1770 / [graphic]. [1770?]. https://collections.library.yale.edu/catalog/10980024.

APA, 6th edition

Watson, James, 1740-1790, printmaker. ([1770?])[Reverendus Admodum Carolus Lyttelton Nuper Episcopus Carliolensis et Societatis Anitquariorum Praeses honoris & gratitudinis ergo voluit Soc. Ant. Lond. 1770 / [graphic]]. https://collections.library.yale.edu/catalog/10980024.