MLA

Kay, John, 1742-1826, printmaker. [Voltaire, the French philosopher, and Mr. Watson, an Edinburgh messenger] [graphic]. [between 1837 and 1838]. https://collections.library.yale.edu/catalog/10731062.

APA, 6th edition

Kay, John, 1742-1826, printmaker. ([between 1837 and 1838])[[Voltaire, the French philosopher, and Mr. Watson, an Edinburgh messenger] [graphic]]. https://collections.library.yale.edu/catalog/10731062.