MLA

Map, Sanborn, and issuing body Publishing Co. New London, Conn. 1884. https://collections.library.yale.edu/catalog/11201789.

APA, 6th edition

Map, S., & Publishing Co., issuing body. (1884). New London, Conn. [Atlases, Cadastral maps, Connecticut, Fire insurance maps, local, New London]. https://collections.library.yale.edu/catalog/11201789.