Thangata, P. H., M. Mudhara, C. Grier, and P. E. Hildebrand. “Potential for Agroforestry Adoption in Southern Africa: A Comparative Study of Improved Fallow and Green Manure Adoption in Malawi, Zambia and Zimbabwe”. Ethnobotany Research and Applications, vol. 5, Dec. 2007, pp. 067-75, https://ethnobotanyjournal.org/index.php/era/article/view/119.