MLA

Sanborn Map Company, issuing body. Insurance Maps of Greenwich, Fairfield Co., Connecticut. 1912. https://collections.library.yale.edu/catalog/11128863.

APA, 6th edition

Sanborn Map Company, issuing body. (1912). Insurance Maps of Greenwich, Fairfield Co., Connecticut. [Atlases--Connecticut--Greenwich (Town)--1912.--local, Cadastral maps--Connecticut--Greenwich (Town)--1912.--local]. https://collections.library.yale.edu/catalog/11128863.