Burt, D. (1997). A proactive handbook for managers. Jaico.
Chicago Style aipamenaBurt, David. A Proactive Handbook for Managers. Mumbai: Jaico, 1997.
MLA aipamenaBurt, David. A Proactive Handbook for Managers. Jaico, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.