Oyelade, O. A., and K. C. Oni. “Modelling of Tractor Fuel Consumption for Harrowing Operation in a Sandy Loam Soil”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, Vol. 14, no. SP.i4, Dec. 2018, pp. 8-19, https://azojete.com.ng/index.php/azojete/article/view/112.