MLA

Sanborn Map Company, issuing body. Litchfield, Litchfield County, Connecticut. 1923. https://collections.library.yale.edu/catalog/11138821.

APA, 6th edition

Sanborn Map Company, issuing body. (1923). Litchfield, Litchfield County, Connecticut. [Atlases, Cadastral maps, Connecticut, Fire insurance maps, Litchfield, local]. https://collections.library.yale.edu/catalog/11138821.