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North American P-51 Mustang North Carolina (lớp thiết giáp hạm) North American F-86 Sabre Northrop Grumman B-2 Spirit Northrop F-5 Northrop Grumman RQ-4 Global Hawk North American B-25 Mitchell Northrop P-61 Black Widow North American F-100 Super Sabre North Bucks & District Football LeagueTài liệu tham khảo
WikiPedia: Northrop_YF-23 http://www.physorg.com/news73195391.html http://www.voodoo.cz/yf23/info.html http://www.dfrc.nasa.gov/gallery/Photo/YF-23/HTML/... http://www.nationalmuseum.af.mil/factsheets/factsh... http://www.nationalmuseum.af.mil/photos/index.asp?... http://home.att.net/~jbaugher4/f23_1.html http://www.vectorsite.net/avf22.html http://www.aviastar.org/air/usa/northrop_f-23.php http://www.globalsecurity.org/military/systems/air... http://www.globalsecurity.org/military/systems/air...