APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

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