Gould, G. L. (1977). Ground work. HBJ.
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Dyfyniad Arddull Chicago
Gould, Gerald L. Ground Work. New York: HBJ, 1977.
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Dyfyniad MLA
Gould, Gerald L. Ground Work. HBJ, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.