MLA

Sanborn Map Company, issuing body. Derby, Including East Derby, New Haven County, Connecticut. 1924. https://collections.library.yale.edu/catalog/11107699.

APA, 6th edition

Sanborn Map Company, issuing body. (1924). Derby, including East Derby, New Haven County, Connecticut. [Atlases, Cadastral maps, Connecticut, Derby, Fire insurance maps, local]. https://collections.library.yale.edu/catalog/11107699.