Drucker, P. F. (1999). Management challenges for the 21st century. Butterworth-Heinemann.
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Dyfyniad Arddull Chicago
Drucker, Peter F. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 1999.
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Dyfyniad MLA
Drucker, Peter F. Management Challenges for the 21st Century. Butterworth-Heinemann, 1999.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.