(2004). Harvard Business Review Mei 2004. HBR.
Chicago Style (17. basım) AtıfHarvard Business Review Mei 2004. HBR, 2004.
MLA (8th ed.) AtıfHarvard Business Review Mei 2004. HBR, 2004.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..
(2004). Harvard Business Review Mei 2004. HBR.
Chicago Style (17. basım) AtıfHarvard Business Review Mei 2004. HBR, 2004.
MLA (8th ed.) AtıfHarvard Business Review Mei 2004. HBR, 2004.