Northrop Corporation (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Northrop Corporation" in Polish language version.

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archive.org

Northrop Grumman Corporation. W: International directory of company histories. T. 111. Detroit: St. James Press, 2010, s. 343-346. ISBN 978-1-4144-4107-8. [dostęp 2023-07-09].
Northrop Corporation. W: Gary Hoover, Alta Campbell, Patrick J. Spain: Hoover's handbook of American business 1993. Austin: The Reference Press, 1992, s. 427. ISBN 978-1-878753-05-2. [dostęp 2023-07-09].
William R. Sears: John Knudsen Northrop. W: National Academy of Engineering of the United States of America: Memorial Tributes. T. 2. Waszyngton: National Academy Press, 1983, s. 229-230. ISBN 978-0-309-03482-1.

Henry Weinstein: Northrop admits to secret fund. The New York Times, 1974-10-12. [dostęp 2023-07-09]. (ang.).

Dave McNary: Northrop announces headquarters sale. UPI, 31-01-1990. [dostęp 2023-07-09]. (ang.).