MLA

Sanborn-Perris Map Co., issuing body. Insurance Maps of Derby and Shelton, New Haven and Fairfield Co's., Connecticut. 1901. https://collections.library.yale.edu/catalog/11107696.

APA, 6th edition

Sanborn-Perris Map Co., issuing body. (1901). Insurance maps of Derby and Shelton, New Haven and Fairfield Co's., Connecticut. [Atlases, Cadastral maps, Connecticut, Derby, Fire insurance maps, local, Shelton]. https://collections.library.yale.edu/catalog/11107696.