MLA

Bartolozzi, Francesco, 1727-1815, printmaker. To the King's Most Excellent Majesty, this plate, The death of the Earl of Chatham, is, with his most gracious permission, humbly inscrbed by his Majesty's most faithful subject and dutiful servt., John Singleton Copley [graphic]. [1 May 1791]. https://collections.library.yale.edu/catalog/10996975.

APA, 6th edition

Bartolozzi, Francesco, 1727-1815, printmaker. ([1 May 1791])[To the King's Most Excellent Majesty, this plate, The death of the Earl of Chatham, is, with his most gracious permission, humbly inscrbed by his Majesty's most faithful subject and dutiful servt., John Singleton Copley [graphic]]. https://collections.library.yale.edu/catalog/10996975.