MLA

Sanborn Map Company, issuing body. Wallingford, New Haven County, Connecticut. 1919. https://collections.library.yale.edu/catalog/11675888.

APA, 6th edition

Sanborn Map Company, issuing body. (1919). Wallingford, New Haven County, Connecticut. [Atlases--Connecticut--Wallingford--1919, Cadastral maps--Connecticut--Wallingford--1919, Fire insurance maps--Connecticut--Wallingford--1919]. https://collections.library.yale.edu/catalog/11675888.