Dibaba, Debela Geleta, and Wogene Markos Dummo. 2016. “Exploring Researches on Impact Assessment: A Methodological Review”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 25 (3):185-90. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/5242.