Ochieng, D. D. O. . “Measuring Client Retention Profitability through Data-Driven RFM Techniques in Health Product Logistics Firms”. Library of Frontline Medical Sciences and Pharmaceutical Journal, vol. 6, no. 05, May 2026, pp. 26-31, https://www.frontlinelibrary.org/index.php/lfmspj/article/view/429.