MLA

Map, Sanborn, and issuing body Publishing Co. New Canaan, Fairfield Co., Conn. 1889. https://collections.library.yale.edu/catalog/11175783.

APA, 6th edition

Map, S., & Publishing Co., issuing body. (1889). New Canaan, Fairfield Co., Conn. [Cadastral maps--Connecticut--New Canaan--1889, Fire insurance maps--Connecticut--New Canaan--1889]. https://collections.library.yale.edu/catalog/11175783.