Harvard Business Review. (2009). The HBR list: Breakthrough ideas for 2009. Harvard Business.
Chicago Style aipamenaHarvard Business Review. The HBR List: Breakthrough Ideas for 2009. Boston: Harvard Business, 2009.
MLA aipamenaHarvard Business Review. The HBR List: Breakthrough Ideas for 2009. Harvard Business, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.