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Northrop Grumman B-2 Spirit Northrop F-5 Northrop Grumman RQ-4 Global Hawk Northrop P-61 Black Widow Northrop Grumman Northrop YF-23 Northrop Grumman B-21 Raider Northrop F-20 Tigershark Northrop YF-17 Northrop Grumman E-2 HawkeyeTài liệu tham khảo
WikiPedia: Northrop Grumman B-2 Spirit http://www.airforce-magazine.com/MagazineArchive/M... http://www.airforce-magazine.com/MagazineArchive/P... http://www.airforce-technology.com/projects/b2/ http://www.cleveland.com/nation/index.ssf/2010/06/... http://www.flightglobal.com/blogs/the-dewline/2008... http://www.howitworksdaily.com/technology/b-2-stea... http://www.as.northropgrumman.com/products/b2spiri... http://www.nytimes.com/1997/08/23/world/the-2-bill... http://www.pacificnewscenter.com/index.php?option=... http://www.youtube.com/watch?v=_ZCp5h1gK2Q