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Dyfyniad Arddull ChicagoBeer, Ferdinand Pierre, and E. Russell Johnston. Vector Mechanics for Engineers. New York: McGraw-Hill, 1962.
Dyfyniad MLABeer, Ferdinand Pierre, and E. Russell Johnston. Vector Mechanics for Engineers. McGraw-Hill, 1962.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.