Koontz, H., O'Donnell, C., & Weihrich, H. (1986). Essentials of management (4th ed.). McGraw-Hill.
Cita Chicago (17th ed.)Koontz, Harold, Cyril O'Donnell, i Heinz Weihrich. Essentials of Management. 4th ed. New York: McGraw-Hill, 1986.
Cita MLA (8th ed.)Koontz, Harold, et al. Essentials of Management. 4th ed. McGraw-Hill, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.