Northrop X-21: Perbedaan antara revisi
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* Winchester, Jim. ''X-Planes and Prototypes''. London: Amber Books Ltd., 2005. ISBN 1-904687-40-7.
* [http://users.dbscorp.net/jmustain/x21.htm "X-Planes Detailed Data - Northrop X-21A"] {{Webarchive|url=https://web.archive.org/web/20120206072424/http://users.dbscorp.net/jmustain/x21.htm |date=2012-02-06 }} Retrieved: 14 February 2007.
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