APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

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