APA citiranje

Drucker, P. F. 1. (1999). Management challenges for the 21st century. Oxford: Butterworth-Heinemann.

Trích dẫn kiểu Chicago

Drucker, Peter F. 1909-. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 1999.

MLA citiranje

Drucker, Peter F. 1909-. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 1999.

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