MLA

Map, Sanborn, and issuing body Publishing Co. Insurance Maps of New Haven, Connecticut. Volume 2. 1886. https://collections.library.yale.edu/catalog/11175977.

APA, 6th edition

Map, S., & Publishing Co., issuing body. (1886). Insurance maps of New Haven, Connecticut. Volume 2. [Atlases, Cadastral maps, Connecticut, Fire insurance maps, local, New Haven]. https://collections.library.yale.edu/catalog/11175977.