Keeton, W. T., Gould, C. G., & Gould, J. L. (1993). Biological science (5th ed.). Norton.
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Dyfyniad Arddull Chicago
Keeton, William T., Carol Grant Gould, and James L. Gould. Biological Science. 5th ed. New York: Norton, 1993.
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Dyfyniad MLA
Keeton, William T., et al. Biological Science. 5th ed. Norton, 1993.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.