Biggs, A. (2001). Science Voyages: Earth & life sciences. McGraw-Hill.
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Dyfyniad Arddull Chicago
Biggs, Alton. Science Voyages: Earth & Life Sciences. New York: McGraw-Hill, 2001.
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Dyfyniad MLA
Biggs, Alton. Science Voyages: Earth & Life Sciences. McGraw-Hill, 2001.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.