Lightman, A. P., Press, . W. H., Price, R. H., & Teukolsky, S. A. (1975). Problem book in relativity and gravitation. Princeton University Press.
Lua i Stíl Chicago (17ú heag.)Lightman, Alan P., William H. Press, Richard H. Price, agus Saul A. Teukolsky. Problem Book in Relativity and Gravitation. Princeton, N.J.: Princeton University Press, 1975.
Lua MLA (8ú heag.)Lightman, Alan P., et al. Problem Book in Relativity and Gravitation. Princeton University Press, 1975.
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