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Dyfyniad Arddull ChicagoLing, Frederic Fongsun. Surface Mechanics. New York: Wiley Eastern, 1973.
Dyfyniad MLALing, Frederic Fongsun. Surface Mechanics. Wiley Eastern, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.