Unionville, Hartford County, Connecticut.
MLA
Sanborn Map Company, issuing body. Unionville, Hartford County, Connecticut. 1931. https://collections.library.yale.edu/catalog/11675410.
APA, 6th edition
Sanborn Map Company, issuing body. (1931). Unionville, Hartford County, Connecticut. [Atlases--Connecticut--Avon--1931, Atlases--Connecticut--Unionville--1931, Cadastral maps--Connecticut--Avon--1931, Cadastral maps--Connecticut--Unionville--1931, Fire insurance maps--Connecticut--Avon--1931, Fire insurance maps--Connecticut--Unionville--1931]. https://collections.library.yale.edu/catalog/11675410.