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Dyfyniad Arddull ChicagoBEER, Ferdinand P., E. Russell JOHNSTON, and Elliot R. EISENBERG. Vector Mechanics for Engineers: Statics. Ed.6. Boston: McGraw-Hill, 1996.
Dyfyniad MLABEER, Ferdinand P., et al. Vector Mechanics for Engineers: Statics. Ed.6. McGraw-Hill, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.