Dyfyniad APA

Drucker,Peter F. (1999). Management challenges for the 21st century. Butterworth - Heinemann.

Dyfyniad Arddull Chicago

Drucker,Peter F. Management Challenges for the 21st Century. Oxford: Butterworth - Heinemann, 1999.

Dyfyniad MLA

Drucker,Peter F. Management Challenges for the 21st Century. Butterworth - Heinemann, 1999.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.