MLA

Gillray, James, 1756-1815, printmaker. "Symptoms of deep-thinking" "sinking from thought to thought, a vast profund". [graphic]. [25 March 1800]. https://collections.library.yale.edu/catalog/10953041.

APA, 6th edition

Gillray, James, 1756-1815, printmaker. ([25 March 1800])["Symptoms of deep-thinking" "sinking from thought to thought, a vast profund". [graphic]]. https://collections.library.yale.edu/catalog/10953041.