Beatty, J., & Drucker, P. F. (1998). The world according to Peter Drucker. Universities Press.
Chicago Style aipamenaBeatty, Jack, and Peter F. Drucker. The World According to Peter Drucker. New York ; india: Universities Press, 1998.
MLA aipamenaBeatty, Jack, and Peter F. Drucker. The World According to Peter Drucker. Universities Press, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.