Weihrich, H., & Koontz, H. (1993). Management: A global perspective (Tenth edition.). McGraw-Hill.

Weihrich, Heinz, and Harold Koontz. Management: A Global Perspective. Tenth edition. New York: McGraw-Hill, 1993.

Weihrich, Heinz, and Harold Koontz. Management: A Global Perspective. Tenth edition. McGraw-Hill, 1993.