MLA

Sanborn Map Company, issuing body. Thomaston, Litchfield County, Connecticut. 1924. https://collections.library.yale.edu/catalog/11672033.

APA, 6th edition

Sanborn Map Company, issuing body. (1924). Thomaston, Litchfield County, Connecticut. [Atlases--Connecticut--Thomaston--1924, Cadastral maps--Connecticut--Thomaston--1924, Fire insurance maps--Connecticut--Thomaston--1924]. https://collections.library.yale.edu/catalog/11672033.