MLA

Sanborn-Perris Map Co., issuing body. Insurance Maps of Middletown, Middlesex County, Connecticut. 1901. https://collections.library.yale.edu/catalog/11139446.

APA, 6th edition

Sanborn-Perris Map Co., issuing body. (1901). Insurance maps of Middletown, Middlesex County, Connecticut. [Atlases, Cadastral maps, Connecticut, Fire insurance maps, local, Middletown]. https://collections.library.yale.edu/catalog/11139446.