Cite

The kingdoms of Spain and Portugal : divided into their Great Provinces

MLA

Sayer, Robert, 1725-1794. The kingdoms of Spain and Portugal : divided into their Great Provinces. 2d March 1772.. https://collections.library.yale.edu/catalog/2046611.

APA, 6th edition

Sayer, Robert, 1725-1794. (2d March 1772.)[The kingdoms of Spain and Portugal : divided into their Great Provinces]. https://collections.library.yale.edu/catalog/2046611.