Drucker, P. F. The practice of management. Mercury.
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Dyfyniad Arddull Chicago
Drucker, Peter F. The Practice of Management. New York: Mercury.
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Dyfyniad MLA
Drucker, Peter F. The Practice of Management. Mercury.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.