MLA

Sanborn-Perris Map Co., issuing body. Thomaston, Litchfield Co., Conn. 1890. https://collections.library.yale.edu/catalog/11671980.

APA, 6th edition

Sanborn-Perris Map Co., issuing body. (1890). Thomaston, Litchfield Co., Conn. [Atlases--Connecticut--Thomaston--1890, Cadastral maps--Connecticut--Thomaston--1890, Fire insurance maps--Connecticut--Thomaston--1890]. https://collections.library.yale.edu/catalog/11671980.