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Dyfyniad Arddull ChicagoAgarwal, M P. Future Sources of Electrical Power. S Chand & Co. Ltd., New Delhi, 1999.
Dyfyniad MLAAgarwal, M P. Future Sources of Electrical Power. 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.