MLA

Sanborn-Perris Map Co., issuing body. Insurance Maps of Norwalk, Fairfield Co., Connecticut. 1896. https://collections.library.yale.edu/catalog/11580355.

APA, 6th edition

Sanborn-Perris Map Co., issuing body. (1896). Insurance maps of Norwalk, Fairfield Co., Connecticut. [Atlases--Connecticut--Norwalk--1896, Cadastral maps--Connecticut--Norwalk--1896, Fire insurance maps--Connecticut--Norwalk--1896]. https://collections.library.yale.edu/catalog/11580355.