Insurance maps of Norwalk, Connecticut. and Insurance maps of Norwalk, Connecticut: [New sheets].
MLA
Sanborn Map Company, issuing body. Insurance Maps of Norwalk, Connecticut., Insurance Maps of Norwalk, Connecticut: [New Sheets]. 0AD. https://collections.library.yale.edu/catalog/11687917.
APA, 6th edition
Sanborn Map Company, issuing body. (0 C.E.). Insurance maps of Norwalk, Connecticut., Insurance maps of Norwalk, Connecticut: [New sheets]. [Atlases--Connecticut--Norwalk--1922, Cadastral maps--Connecticut--Norwalk--1922, Fire insurance maps--Connecticut--Norwalk--1922]. https://collections.library.yale.edu/catalog/11687917.