MLA

Sanborn-Perris Map Co., issuing body. Waterbury, New Haven County, Connecticut. 1890. https://collections.library.yale.edu/catalog/11676424.

APA, 6th edition

Sanborn-Perris Map Co., issuing body. (1890). Waterbury, New Haven County, Connecticut. [Atlases--Connecticut--Waterbury--1890, Cadastral maps--Connecticut--Waterbury--1890, Fire insurance maps--Connecticut--Waterbury--1890]. https://collections.library.yale.edu/catalog/11676424.