Joshua Emeka Ozor, Oludayo Sofoluwe, and Dazok Donald Jambol, “A Holistic Engineering Model for Managing Non-Productive Time (NPT) in Onshore Drilling: Prevention, Response, and Recovery”, Int J Sci Res Civil Engg, vol. 7, no. 3, pp. 117–130, May 2023, Accessed: Mar. 18, 2026. [Online]. Available: https://ijsrce.com/index.php/home/article/view/IJSRCE237315