Bolkcom, Christopher & Klaus, Jon D. Air Force Aerial Refueling Methods: Flying Boom versus Hose-and-Drogue. Washington D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metacrs6702/. Accessed January 21, 2017.
Note: Inconsistencies in capitalization and punctuation within the Digital Library may affect this citation. Before using this citation in formal writing, please consult your preferred style manual. More information.