MLA

Sanborn Map Company, issuing body. Essex, Middlesex Co., Conn. 1908. https://collections.library.yale.edu/catalog/11117276.

APA, 6th edition

Sanborn Map Company, issuing body. (1908). Essex, Middlesex Co., Conn. [Atlases, Cadastral maps, Connecticut, Essex (Town), Fire insurance maps, local]. https://collections.library.yale.edu/catalog/11117276.