Maturity Model for Software (Version 1.1) (PDF). Technical Report (Pittsburgh, PA: Software Engineering Institute, Carnegie Mellon University). February 1993
(原始内容存档于2010-05-27). Myler, Joseph L. Latest Red Rumor: They'll Bomb Moon. Pittsburgh Press. November 1, 1957: 13 [September 9, 2011]. (原始内容存档于2020-03-28).
Collection of Westinghouse Electric and Manufacturing Company contracts, Pittsburgh, Pa. Berton, Pierre. Niagara: A History of the Falls. New York: Kodansha