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Dyfyniad Arddull ChicagoStone, Richard M. Harrison's Principles of Internal Medicine: Pretest Self Assessment and Review. 13th ed. New York: McGraw-Hill, 1994.
Dyfyniad MLAStone, Richard M. Harrison's Principles of Internal Medicine: Pretest Self Assessment and Review. 13th ed. McGraw-Hill, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.