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Dyfyniad Arddull ChicagoDyer, Dr. Wayne W. CHANGE YOUT THOUGHTS CHANGE YOUR LIFE. Penerbit Erlangga, 2007.
Dyfyniad MLADyer, Dr. Wayne W. CHANGE YOUT THOUGHTS CHANGE YOUR LIFE. Penerbit Erlangga, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.