(1974). Earth Manual (2nd ed.). CBS Publishers & Distributors.
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Dyfyniad Arddull Chicago
Earth Manual. 2nd ed. New Delhi: CBS Publishers & Distributors, 1974.
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Dyfyniad MLA
Earth Manual. 2nd ed. CBS Publishers & Distributors, 1974.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.