MLA

Map, Sanborn, and issuing body Publishing Co. South Norwalk, Fairfield County, Connecticut. 1889. https://collections.library.yale.edu/catalog/11623290.

APA, 6th edition

Map, S., & Publishing Co., issuing body. (1889). South Norwalk, Fairfield County, Connecticut. [Atlases--Connecticut--Norwalk--South Norwalk--1889, Cadastral maps--Connecticut--Norwalk--South Norwalk--1889, Fire insurance maps--Connecticut--Norwalk--South Norwalk--1889]. https://collections.library.yale.edu/catalog/11623290.