Keen, J. M. (2011). Making technology investments profitable: ROI road map from business case to value realization (2nd ed.). Wiley.
Chicago-čujuhus (17. p.)Keen, Jack M. Making Technology Investments Profitable: ROI Road Map from Business Case to Value Realization. 2nd ed. Hoboken, N.J.: Wiley, 2011.
MLA-čujuhus (9. p.)Keen, Jack M. Making Technology Investments Profitable: ROI Road Map from Business Case to Value Realization. 2nd ed. Wiley, 2011.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.