Bekele, Adam, and Yitayal Abebe. “Analysis of Adoption Spell of Hybrid Maize in the Central Rift Valley, Oromyia National Regional State of Ethiopia: A Duration Model Approach”. Journal of Science, Technology and Arts Research 3, no. 4 (December 30, 2014): 207–213. Accessed September 23, 2024. https://journals.wgu.edu.et/index.php/star/article/view/553.