APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.