Freeman & Co, 1973, ISBN 0-7167-0344-0* Relativity DeMystified, D. McMahon, Mc Graw Hill (USA), 2006, ISBN 0-07-145545-0* Relativity, Gravitation, and Cosmology, R.J.A.
Freeman & Co, 1973, ISBN 0-7167-0344-0* Relativity DeMystified, D. McMahon, Mc Graw Hill (USA)، 2006, ISBN 0-07-145545-0* Relativity, Gravitation, and Cosmology, R.J.A.