- Freely downloadable lecture notes by S.M. Carrol, gr-qc/9712019.
- also as a book: S.M. Carrrol: Spacetime and Geometry: An Introduction to General Relativity, Addison-Wesley, 2003
- Compact lecture notes with exercises, Jouko Mickelsson, Hkan Snellman, and Tommy Ohlsson: Relativity Theory, KTH, 2005 [kompendium]
C.W. Misner, K.S. Thorne, and J.A. Wheeler, Gravitation, Freeman, 1973. (A thorough introduction to the theory of relativity, both its mathematical methods and astronomical applications)
Einstein's original paper on general relativity, alberteinstein.info
- A more light text Notes Dunsby
Here are some problems from Jouko's book: