MLA

Sanborn Map Company, issuing body. Sanborn Maps of New Haven. Sanborn Map Company, 1973. https://collections.library.yale.edu/catalog/11199137.

APA, 6th edition

Sanborn Map Company, issuing body. (1973). Sanborn maps of New Haven [Maps, Atlases, Cadastral maps, Fire insurance maps]. Sanborn Map Company. https://collections.library.yale.edu/catalog/11199137.