ebrary, Inc. (2006). The Hutchinson encyclopedia of science. Helicon Pub..
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Dyfyniad Arddull Chicago
ebrary, Inc. The Hutchinson Encyclopedia of Science. Oxon: Helicon Pub., 2006.
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Dyfyniad MLA
ebrary, Inc. The Hutchinson Encyclopedia of Science. Helicon Pub., 2006.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.