MLA

Sanborn Map Company, issuing body. Insurance Maps of Hartford, Connecticut. Volume 3. 1923. https://collections.library.yale.edu/catalog/11128560.

APA, 6th edition

Sanborn Map Company, issuing body. (1923). Insurance maps of Hartford, Connecticut. Volume 3. [Atlases, Cadastral maps, Connecticut, Fire insurance maps, Hartford, local, West Hartford]. https://collections.library.yale.edu/catalog/11128560.