APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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