Bolton, W. (1977). Physical science. Blackie.
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Dyfyniad Arddull Chicago
Bolton, W. Physical Science. London: Blackie, 1977.
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Dyfyniad MLA
Bolton, W. Physical Science. Blackie, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.