“Classification and Suitability Assessment of Soils on a Fine Grained Biotite Schist Toposequence for Maize and Cassava Production in Ife Area, Southwestern Nigeria”. 2020. Global Journal of Science Frontier Research 20 (D3): 41-55. https://www.journalofscience.org/index.php/GJSFR/article/view/2664.