Jasilionienė, Regina, and Rima Tamošiūnienė. “Investment Efficiency Evaluation of Customer Relationship Management System: Theoretical and Practical Aspects of Return on Investment Methodology Application”. Business: Theory and Practice 9, no. 3 (September 19, 2008): 221-228. Accessed November 17, 2024. https://jcem.vgtu.lt/index.php/BTP/article/view/9137.