KOONTZ, H., & WEIHRICH, H. (1988). Management.-- Ed.9. McGraw-Hill Book.

KOONTZ, Harold, and Heinz WEIHRICH. Management.-- Ed.9. New York: McGraw-Hill Book, 1988.

KOONTZ, Harold, and Heinz WEIHRICH. Management.-- Ed.9. McGraw-Hill Book, 1988.