MLA

Sanborn Map Company, issuing body. Insurance Maps of Rockville, Tolland County, Connecticut. 1911. https://collections.library.yale.edu/catalog/11595819.

APA, 6th edition

Sanborn Map Company, issuing body. (1911). Insurance maps of Rockville, Tolland County, Connecticut. [Atlases--Connecticut--Rockville--1911, Cadastral maps--Connecticut--Naugatuck--1911, Fire insurance maps--Connecticut--Rockville--1911]. https://collections.library.yale.edu/catalog/11595819.