Oyenmwen Umoren, et al. “A Comparative Evaluation of CRM, Marketing Automation, and Engagement Platforms in Driving Data-Driven Sales Funnel Performance”. International Journal of Scientific Research in Computer Science, Engineering and Information Technology, vol. 10, no. 4, July 2024, pp. 672-97, https://www.ijsrcseit.com/index.php/home/article/view/CSEIT25113493.