1. Grøn, Ø. & Hetvik, S. Einstein's General Theory of Relativity With Modern Applications in Cosmology, (Springer, New York, 2007).
2. Krori, K. D. Fundamentals of Special & General Relativity (PHI Learning, New Delhi, 2010).
3. Landau, L. & Lifshitz, E. M. Classical Theory of Fields, (Pergamon, Oxford, 1962).
4. D'Inverno, R. Introducing Einstein's Relativity (Clarendon Press, Oxford, 2004).
5. Eddington, E. S. The Mathematical Theory of Relativity, (Cambridge Univ. Press, Cambridge, 1923).