MLA

Map, Sanborn, and issuing body Publishing Co. New Britain, Conn. 1884. https://collections.library.yale.edu/catalog/11175777.

APA, 6th edition

Map, S., & Publishing Co., issuing body. (1884). New Britain, Conn. [Atlases, Cadastral maps, Connecticut, Fire insurance maps, local, New Britain]. https://collections.library.yale.edu/catalog/11175777.