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Dyfyniad Arddull ChicagoGambhir, R S., Deepak Banerjee, and M C. Durgapal. Introductory Physics. New Delhi: Tata Mc Graw - Hill, 1972.
Dyfyniad MLAGambhir, R S., et al. Introductory Physics. Tata Mc Graw - Hill, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.