Ola, I., A. Adisa, I. Ubaka-Ojogwu, J. Solomon, J. Ojediran, and E. Ajisegiri. “Performance Evaluation of Selected Cassava Roots Harvesters”. Journal of Engineering Research, Vol. 24, no. 1, Feb. 2020, pp. 40-52, http://jer.unilag.edu.ng/article/view/587.