YPF. (2009). Argentina: Guía YPF-2009.2010 (1a. ed.). YPF.
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Dyfyniad Arddull Chicago
YPF. Argentina: Guía YPF-2009.2010. 1a. ed. Buenos Aires: YPF, 2009.
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Dyfyniad MLA
YPF. Argentina: Guía YPF-2009.2010. 1a. ed. YPF, 2009.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.