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Dyfyniad Arddull ChicagoWeinberg, Steven. Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity. New York : INew Delhi: Wiley, 1972.
Dyfyniad MLAWeinberg, Steven. Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity. Wiley, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.