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Dyfyniad Arddull ChicagoGregoryev, V., and G. Myakishev. The Forces of Nature. Moscow: MIR, 1971.
Dyfyniad MLAGregoryev, V., and G. Myakishev. The Forces of Nature. MIR, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.