MLA

Harding, E. (Edward), 1755-1840, printmaker. Mary Magdalen, wife of Horatio Lord Walpole from an original in the collection of Lord Walpole / [graphic]. [1 February 1802]. https://collections.library.yale.edu/catalog/16719145.

APA, 6th edition

Harding, E. (Edward), 1755-1840, printmaker. ([1 February 1802])[Mary Magdalen, wife of Horatio Lord Walpole from an original in the collection of Lord Walpole / [graphic]]. https://collections.library.yale.edu/catalog/16719145.