MLA

Sanborn Map Company, issuing body. New Milford, Litchfield County, Connecticut. 1909. https://collections.library.yale.edu/catalog/11551308.

APA, 6th edition

Sanborn Map Company, issuing body. (1909). New Milford, Litchfield County, Connecticut. [Atlases--Connecticut--New Milford--1909, Cadastral maps--Connecticut--New Milford--1909, Fire insurance maps--Connecticut--New Milford--1909]. https://collections.library.yale.edu/catalog/11551308.