Abba-Aji, M. A., M. I. Ishaq, and I. Halliru. “Comparative Analysis of Cutting Fluids Developed from Groundnut Oil and Used Engine Oil for Machining Operation”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, Vol. 20, no. 2, June 2024, pp. 369-74, https://azojete.com.ng/index.php/azojete/article/view/898.