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Dyfyniad Arddull ChicagoSheridan, Brett C. ... [et al.]. So You're Having Heart Bypass Surgery. Hoboken, NJ: John Wiley & Sons, 2003.
Dyfyniad MLASheridan, Brett C. ... [et al.]. So You're Having Heart Bypass Surgery. Hoboken, NJ: John Wiley & Sons, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.