Getahun, B. T., and Y. A. Yeshanew. “Historical Survey of Tourism Industry in Ethiopia and Its Potential for Economic Development: The Case of Lake Tana Region”. The International Journal of Business & Management, vol. 4, no. 2, Feb. 2016, http://www.internationaljournalcorner.com/index.php/theijbm/article/view/126227.