Onomu, A., M. Aliber, and I. Agbugba. “TRACTOR SERVICES CHALLENGES AND CURRENT DEMAND TRENDS BY SMALLHOLDER FARMERS IN NIGERIA”. Journal of Agribusiness and Rural Development, Vol. 58, no. 4, Dec. 2020, pp. 379–391, doi:10.17306/J.JARD.2020.01288.