Hughes, M. (1989). Bodyclock: The effects of time on human health. Facts on File.
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Dyfyniad Arddull Chicago
Hughes, Martin. Bodyclock: The Effects of Time on Human Health. New York: Facts on File, 1989.
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Dyfyniad MLA
Hughes, Martin. Bodyclock: The Effects of Time on Human Health. Facts on File, 1989.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.