(1973). IPO. International Progress Organisation. Internat. Progress Organisation.
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Dyfyniad Arddull Chicago
IPO. International Progress Organisation. Innsbruck: Internat. Progress Organisation, 1973.
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Dyfyniad MLA
IPO. International Progress Organisation. Internat. Progress Organisation, 1973.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.