Manning, G. (2019). The art of leadership (Sixth edition.). McGraw-Hill Education.
Chicago Style aipamenaManning, George. The Art of Leadership. Sixth edition. New York, New York: McGraw-Hill Education, 2019.
MLA aipamenaManning, George. The Art of Leadership. Sixth edition. McGraw-Hill Education, 2019.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.