Wald, Robert M., author
University of Chicago Press, 1984
Buku Teks
Das, Anadijiban
Springer, 2012
eBooks
Gourgoulhon, Eric, author
Springer, 2012
eBooks
Buchdahl, H.A., author
John Wiley & Sons, 1981
Buku Teks
Dirac, P. A. M.
John Wiley & Sons, 1975
Buku Teks