APA (7th ed.) Citation

Koontz, H., & Weihrich, H. (1990). Essentials of management (5th ed.). McGraw-Hill.

Chicago Style (17th ed.) Citation

Koontz, Harold, and Heinz Weihrich. Essentials of Management. 5th ed. New York: Singapore: McGraw-Hill, 1990.

MLA (9th ed.) Citation

Koontz, Harold, and Heinz Weihrich. Essentials of Management. 5th ed. McGraw-Hill, 1990.