Kelly, J. (1997). The essence of logic. Prentice- Hall.
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Dyfyniad Arddull Chicago
Kelly, John. The Essence of Logic. New Delhi: Prentice- Hall, 1997.
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Dyfyniad MLA
Kelly, John. The Essence of Logic. Prentice- Hall, 1997.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.