MLA

Map, Sanborn, and issuing body Publishing Co. Stonington, Conn. 1886. https://collections.library.yale.edu/catalog/11633948.

APA, 6th edition

Map, S., & Publishing Co., issuing body. (1886). Stonington, Conn. [Atlases--Connecticut--Stonington--1886, Cadastral maps--Connecticut--Stonington--1886, Fire insurance maps--Connecticut--Stonington--1886]. https://collections.library.yale.edu/catalog/11633948.