MLA

Sayer, Robert, 1725-1794. A new map of France divided into eighty three departments according to the decree of the National Assembly in 1790. Jany. 1st , 1793.. https://collections.library.yale.edu/catalog/10563630.

APA, 6th edition

Sayer, Robert, 1725-1794. (Jany. 1st , 1793.)[A new map of France divided into eighty three departments according to the decree of the National Assembly in 1790]. https://collections.library.yale.edu/catalog/10563630.