MLA

Sanborn Map Company, issuing body. Dayville, Windham Co., Connecticut. 1903. https://collections.library.yale.edu/catalog/11105681.

APA, 6th edition

Sanborn Map Company, issuing body. (1903). Dayville, Windham Co., Connecticut. [Cadastral maps--Connecticut--Killingly (Town)--1903, Fire insurance maps--Connecticut--Killingly (Town)--1903]. https://collections.library.yale.edu/catalog/11105681.