Deme, D., and M. B. Bari. “Traffic Accident Causes and Its Countermeasures on Addis Ababa-Adama Expressway”. Journal of Equity in Sciences and Sustainable Development, vol. 2, no. 2, June 2018, pp. 13-23, https://www.jessdmwu.edu.et/MWU/index.php/files/article/view/28.