MLA

Gregoire, Henri, 1750-1831. An essay on the physical, moral, and political reformation of the Jews ; a work crowned by the Royal Society of Arts and Sciences at Metz / by the Abbe Gregoire. [1791]. https://collections.library.yale.edu/catalog/2055105.

APA, 6th edition

Gregoire, Henri, 1750-1831. ([1791])[An essay on the physical, moral, and political reformation of the Jews ; a work crowned by the Royal Society of Arts and Sciences at Metz / by the Abbe Gregoire]. https://collections.library.yale.edu/catalog/2055105.