MLA

Map, Sanborn, and issuing body Publishing Co. Guilford, Conn. 1884. https://collections.library.yale.edu/catalog/11129040.

APA, 6th edition

Map, S., & Publishing Co., issuing body. (1884). Guilford, Conn. [Atlases--Connecticut--Guilford--1884.--local, Cadastral maps--Connecticut--Guilford--1884.--local]. https://collections.library.yale.edu/catalog/11129040.