Gray, P. (1972). Student dictionary of biology. Van Nostrand Reinhold Company.
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Dyfyniad Arddull Chicago
Gray, Peter. Student Dictionary of Biology. New York: Van Nostrand Reinhold Company, 1972.
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Dyfyniad MLA
Gray, Peter. Student Dictionary of Biology. Van Nostrand Reinhold Company, 1972.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.