Armstrong Michael. (2009). How to be an even better manager/7e (7th ed.). Kogan page.
Chicago Style aipamenaArmstrong Michael. How to Be an Even Better Manager/7e. 7th ed. New Delhi: Kogan page, 2009.
MLA aipamenaArmstrong Michael. How to Be an Even Better Manager/7e. 7th ed. Kogan page, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.