MLA

Map, Sanborn, and issuing body Publishing Co. Derby, Conn. 1885. https://collections.library.yale.edu/catalog/11106566.

APA, 6th edition

Map, S., & Publishing Co., issuing body. (1885). Derby, Conn. [Cadastral maps--Connecticut--Derby--1885, Fire insurance maps--Connecticut--Derby--1885]. https://collections.library.yale.edu/catalog/11106566.