Raga, D., and D. Denu. “Population Density of Cordia Africana Lam. Across Land Use Gradients in Jimma Highlands, Southwest Ethiopia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 35, no. 2, Aug. 2017, pp. 157-66, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/7675.