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Dyfyniad Arddull ChicagoHARVARD BUSINESS SCHOOL PRESS. MANAGERS AS LEADERS. BOSTAN: HARVARD BUSINESS REVIEW SCHOOL, 1991.
Dyfyniad MLAHARVARD BUSINESS SCHOOL PRESS. MANAGERS AS LEADERS. HARVARD BUSINESS REVIEW SCHOOL, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.