APA (7th ed.) Zitazioa

Nick, M. J., & Koenig, K. M. (2004). ROI selling: Increasing revenue, profit & customer loyalty through the 360 degree sales cycle. Dearborn Trade Pub..

Chicago Style (17th ed.) Zitazioa

Nick, Michael J., eta Kurt M. Koenig. ROI Selling: Increasing Revenue, Profit & Customer Loyalty Through the 360 Degree Sales Cycle. Chicago: Dearborn Trade Pub., 2004.

MLA (9th ed.) Zitazioa

Nick, Michael J., eta Kurt M. Koenig. ROI Selling: Increasing Revenue, Profit & Customer Loyalty Through the 360 Degree Sales Cycle. Dearborn Trade Pub., 2004.