MLA

Sanborn-Perris Map Co., issuing body. Westport and Saugatuck, Fairfield Co., Conn. 1891. https://collections.library.yale.edu/catalog/11676585.

APA, 6th edition

Sanborn-Perris Map Co., issuing body. (1891). Westport and Saugatuck, Fairfield Co., Conn. [Atlases--Connecticut--Saugatuck--1891, Atlases--Connecticut--Westport--1891, Cadastral maps--Connecticut--Saugatuck--1891, Cadastral maps--Connecticut--Westport--1891, Fire insurance maps--Connecticut--Saugatuck--1891, Fire insurance maps--Connecticut--Westport--1891]. https://collections.library.yale.edu/catalog/11676585.