MLA

Harding, E. (Edward), 1755-1840, printmaker. Mary Burwell, wife of Robert Walpole from an original at Wolterton / [graphic]. [1 February 1802]. https://collections.library.yale.edu/catalog/16193409.

APA, 6th edition

Harding, E. (Edward), 1755-1840, printmaker. ([1 February 1802])[Mary Burwell, wife of Robert Walpole from an original at Wolterton / [graphic]]. https://collections.library.yale.edu/catalog/16193409.