APA-čujuhus (7. p.)
Nick, M. J., & Koenig, K. M. (2004). ROI selling: Increasing revenue, profit & customer loyalty through the 360 degree sales cycle. Dearborn Trade Pub..
Chicago-čujuhus (17. p.)
Nick, Michael J., juo Kurt M. Koenig. ROI Selling: Increasing Revenue, Profit & Customer Loyalty Through the 360 Degree Sales Cycle. Chicago: Dearborn Trade Pub., 2004.
MLA-čujuhus (9. p.)
Nick, Michael J., juo Kurt M. Koenig. ROI Selling: Increasing Revenue, Profit & Customer Loyalty Through the 360 Degree Sales Cycle. Dearborn Trade Pub., 2004.
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