Carpenter, David M. (2003). NX-2(PDF). United States: Jet Pioneers of America. ISBN9780963338792. Archived from the original(PDF) on 10 November 2014. Retrieved 10 November 2014.
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Carpenter, David M. (2003). NX-2(PDF). United States: Jet Pioneers of America. ISBN9780963338792. Archived from the original(PDF) on 10 November 2014. Retrieved 10 November 2014.