MLA

Sanborn Map Company, issuing body. Insurance Maps of Southington, Hartford County, Connecticut. 1911. https://collections.library.yale.edu/catalog/11624105.

APA, 6th edition

Sanborn Map Company, issuing body. (1911). Insurance maps of Southington, Hartford County, Connecticut. [Atlases--Connecticut--Southington--1911, Cadastral maps--Connecticut--Southington--1911, Fire insurance maps--Connecticut--Southington--1911]. https://collections.library.yale.edu/catalog/11624105.