MLA

Spooner, Charles, 1720-1767, printmaker. The Right Honble. William Pitt Esqr late one of His Majesty's principal Secretaries of State / [graphic]. Octr. 19th 1761.. https://collections.library.yale.edu/catalog/11001140.

APA, 6th edition

Spooner, Charles, 1720-1767, printmaker. (Octr. 19th 1761.)[The Right Honble. William Pitt Esqr late one of His Majesty's principal Secretaries of State / [graphic]]. https://collections.library.yale.edu/catalog/11001140.