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Dyfyniad Arddull ChicagoJain, R.K. Engineering Metrology. Delhi: Khanna Publishers, 1999.
Dyfyniad MLAJain, R.K. Engineering Metrology. Khanna Publishers, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.