Hawking, S. (1988). A brief history of time: Stephen Hawking. Bantam Books.
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Dyfyniad Arddull Chicago
Hawking, Stephen. A Brief History of Time: Stephen Hawking. New York: Bantam Books, 1988.
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Dyfyniad MLA
Hawking, Stephen. A Brief History of Time: Stephen Hawking. Bantam Books, 1988.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.