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Dyfyniad Arddull ChicagoJames, Hubert Maxwell, Nathaniel B. Nichols, and Ralph S. Phillips. Theory of Servomechanisms. New York: McGraw-hill book company, Inc, 1947.
Dyfyniad MLAJames, Hubert Maxwell, et al. Theory of Servomechanisms. McGraw-hill book company, Inc, 1947.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.