MLA

Berthet, Louis, and printmaker. Williamm Pitt [Sic] Il Faut déclarer La Guerre à La France / [Graphic]. publisher not identified, 1778. https://collections.library.yale.edu/catalog/10723152.

APA, 6th edition

Berthet, L., & printmaker. (1778). Williamm Pitt [sic] il faut déclarer la guerre à la France / [graphic] [Engravings France 1778, Stipple engravings France 1778, Portrait prints, Book illustrations]. publisher not identified. https://collections.library.yale.edu/catalog/10723152.