Gary L. Kepplinger, General Counsel. B-311344; B-311344.3; B-311344.4; B-311344.6; B-311344.7; B-311344.8; B-311344.10; B-311344.11, The Boeing Company, June 18, 2008 [online]. 18. jún 2008, [cit. 2012-01-08]. Dostupné online. Archivované 2014-10-23 z originálu.
GAO-04-349, MILITARY AIRCRAFT: DOD Needs to Determine Its Aerial Refueling Aircraft Requirements [online]. [Cit. 2012-01-08]. Dostupné online. Archivované 2011-06-11 z originálu.
GAO-04-349, MILITARY AIRCRAFT: DOD Needs to Determine Its Aerial Refueling Aircraft Requirements [online]. [Cit. 2012-01-08]. Dostupné online. Archivované 2011-06-11 z originálu.
Gary L. Kepplinger, General Counsel. B-311344; B-311344.3; B-311344.4; B-311344.6; B-311344.7; B-311344.8; B-311344.10; B-311344.11, The Boeing Company, June 18, 2008 [online]. 18. jún 2008, [cit. 2012-01-08]. Dostupné online. Archivované 2014-10-23 z originálu.