MLA

Sanborn Map Company, issuing body. East Hartford, Hartford County, Connecticut. 1920. https://collections.library.yale.edu/catalog/11108704.

APA, 6th edition

Sanborn Map Company, issuing body. (1920). East Hartford, Hartford County, Connecticut. [Atlases, Cadastral maps, Connecticut, East Hartford, Fire insurance maps, local]. https://collections.library.yale.edu/catalog/11108704.