APA aipamena

Harold Koontz & Heinz Weihrich. (1990). Essentials of management. Mc Graw-Hill.

Chicago Style aipamena

Harold Koontz and Heinz Weihrich. Essentials of Management. New York: Mc Graw-Hill, 1990.

MLA aipamena

Harold Koontz and Heinz Weihrich. Essentials of Management. Mc Graw-Hill, 1990.