National Research Council (U.S.). Committee on Gravitational Physics & ebrary, Inc. (1999). Gravitational physics: Exploring the structure of space and time. National Academy Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Research Council (U.S.). Committee on Gravitational Physics و Inc ebrary. Gravitational Physics: Exploring the Structure of Space and Time. Washington, DC: National Academy Press, 1999.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Research Council (U.S.). Committee on Gravitational Physics و Inc ebrary. Gravitational Physics: Exploring the Structure of Space and Time. National Academy Press, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.