Bulus, L. N., and T. E. Odetoye. “Biolubricant Production from Parinari Polyandra and Azadirachta Indica Seed Oils Using Trimethylolpropane Polyol. ”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, Vol. 18, no. 2, June 2022, pp. 295-06, https://azojete.com.ng/index.php/azojete/article/view/597.