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Dyfyniad Arddull ChicagoLEFTON ROBERT E. LEADERSHIP THROUGH PEOPLE SKILLS. NEW YORK: MCGRAW-HILL, 2004.
Dyfyniad MLALEFTON ROBERT E. LEADERSHIP THROUGH PEOPLE SKILLS. MCGRAW-HILL, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.