Tài liệu tham khảo WikiPedia: GBU-57 http://www.boeing.com/news/releases/2007/q1/070326... http://www.cnn.com/2004/US/07/20/big.bomb/ http://www.defenseindustrydaily.com/mopping-up-the... //edwardbetts.com/find_link?q=GBU-57 http://www.janes.com/defence/air_forces/news/idr/i... http://www.janes.com/defence/news/jdw/jdw040719_1_... http://www.newsmax.com/archives/articles/2007/7/26... http://www.fbo.gov/index?s=opportunity&mode=form&i... http://webarchive.loc.gov/all/20070818033109/http:... http://feinstein.senate.gov/05speeches/cr-kennedy-...
