MLA

Sanborn-Perris Map Co., issuing body. Ridgefield, Fairfield Co., Conn. 1896. https://collections.library.yale.edu/catalog/11594541.

APA, 6th edition

Sanborn-Perris Map Co., issuing body. (1896). Ridgefield, Fairfield Co., Conn. [Cadastral maps--Connecticut--Ridgefield--1896, Fire insurance maps--Connecticut--Ridgefield--1896]. https://collections.library.yale.edu/catalog/11594541.