MLA

Sanborn Map Company, issuing body. Dayville, Windham Co., Connecticut. 1892. https://collections.library.yale.edu/catalog/11105680.

APA, 6th edition

Sanborn Map Company, issuing body. (1892). Dayville, Windham Co., Connecticut. [Cadastral maps--Connecticut--Killingly (Town)--1892, Fire insurance maps--Connecticut--Killingly (Town)--1892]. https://collections.library.yale.edu/catalog/11105680.