Roberts, J. (1992). The penguin history of the world. Penguin.
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Dyfyniad Arddull Chicago
Roberts, J.M. The Penguin History of the World. 3rd.ed: Penguin, 1992.
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Dyfyniad MLA
Roberts, J.M. The Penguin History of the World. Penguin, 1992.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.