Obrien, D. e. (2008). Penguin yearbook 2009. Penguin Books.
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Dyfyniad Arddull Chicago
Obrien, Derek ed. Penguin Yearbook 2009. New Delhi: Penguin Books, 2008.
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Dyfyniad MLA
Obrien, Derek ed. Penguin Yearbook 2009. Penguin Books, 2008.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.