APA (7th ed.) Zitazioa
Campbell, G. M. (2009). Communications skills for project managers. AMACOM.
Chicago Style (17th ed.) Zitazioa
Campbell, G. Michael. Communications Skills for Project Managers. New York: AMACOM, 2009.
MLA (9th ed.) Zitazioa
Campbell, G. Michael. Communications Skills for Project Managers. AMACOM, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.