(2014). The little green data book. The World Bank.
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Dyfyniad Arddull Chicago
The Little Green Data Book. Washington, District of Columbia: The World Bank, 2014.
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Dyfyniad MLA
The Little Green Data Book. The World Bank, 2014.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.