(1991). The world factbook 1991 (ed.). Central Intelligence Agency.
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Dyfyniad Arddull Chicago
The World Factbook 1991. ed. Washington: Central Intelligence Agency, 1991.
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Dyfyniad MLA
The World Factbook 1991. ed. Central Intelligence Agency, 1991.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.