الگو:Cite nysky
Landau, Sarah; Condit, Carl W. (1996). Rise of the New York Skyscraper, 1865–1913. Yale University Press. ISBN 978-0-300-07739-1. OCLC 32819286.
Landau, Sarah; Condit, Carl W. (1996). Rise of the New York Skyscraper, 1865–1913. Yale University Press. ISBN 978-0-300-07739-1. OCLC 32819286.