MLA

Gravelot, Hubert Francois, 1699-1773, Rousseau, Jean Francois, b. ca. 1740. Le connoisseur. Undated. https://collections.library.yale.edu/catalog/2067556.

APA, 6th edition

Gravelot, Hubert Francois, 1699-1773, & Rousseau, Jean Francois, b. ca. 1740. (Undated)[Le connoisseur]. https://collections.library.yale.edu/catalog/2067556.