Gupta, R. C. (1980). Theory of Relativity. Prentice-Hall of India.
Cita Chicago (17th ed.)Gupta, R. C. Theory of Relativity. New Delhi: Prentice-Hall of India, 1980.
Cita MLA (9th ed.)Gupta, R. C. Theory of Relativity. Prentice-Hall of India, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.