MLA

Sanborn Map Company, issuing body. Wallingford, New Haven County, Connecticut. 1911. https://collections.library.yale.edu/catalog/11675887.

APA, 6th edition

Sanborn Map Company, issuing body. (1911). Wallingford, New Haven County, Connecticut. [Atlases--Connecticut--Wallingford--1911, Cadastral maps--Connecticut--Wallingford--1911, Fire insurance maps--Connecticut--Wallingford--1911]. https://collections.library.yale.edu/catalog/11675887.