Pressel, P., & Allen, N. (2013). Meeting the challenge: The Hexagon KH-9 reconnaissance satellite. Published by American Institute of Aeronautics and Astronautics, Inc..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Pressel, Philip, و Ned Allen. Meeting the Challenge: The Hexagon KH-9 Reconnaissance Satellite. Reston, Virginia: Published by American Institute of Aeronautics and Astronautics, Inc., 2013.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Pressel, Philip, و Ned Allen. Meeting the Challenge: The Hexagon KH-9 Reconnaissance Satellite. Published by American Institute of Aeronautics and Astronautics, Inc., 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.