Gisilanbe, S. A., S. A. Musa, I. J. Lebbiso, S. S. Bilayabu, and H. D. Ali. “Study on Soil Morphology, Classification, Suitability and Capability Classes of Selected Arable Crops on a Toposequence in Adamawa State, Nigeria”. New Perspectives in International Plant and Soil Research Vol. 1, Aug. 2019, pp. 148-59, https://stm1.bookpi.org/index.php/npipsr-v1/article/view/321.