MLA

Sanborn Map Company, issuing body. Collinsville, Hartford County, Connecticut. 1921. https://collections.library.yale.edu/catalog/11088861.

APA, 6th edition

Sanborn Map Company, issuing body. (1921). Collinsville, Hartford County, Connecticut. [Atlases, Cadastral maps, Collinsville, Connecticut, Fire insurance maps, local]. https://collections.library.yale.edu/catalog/11088861.