APA-referens (7:e uppl.)
Pressel, P., & Allen, N. (2013). Meeting the challenge: The Hexagon KH-9 reconnaissance satellite. Published by American Institute of Aeronautics and Astronautics, Inc..
Chicago-referens (17:e uppl.)
Pressel, Philip, och Ned Allen. Meeting the Challenge: The Hexagon KH-9 Reconnaissance Satellite. Reston, Virginia: Published by American Institute of Aeronautics and Astronautics, Inc., 2013.
MLA-referens (9:e uppl.)
Pressel, Philip, och Ned Allen. Meeting the Challenge: The Hexagon KH-9 Reconnaissance Satellite. Published by American Institute of Aeronautics and Astronautics, Inc., 2013.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.