HAILU, Mengistu; MICHAEL, Kassa. Effectiveness of Summer Upgrading Teachers’ Education Program of Primary Schools in Tigray Regional State. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 42, n. 1, p. 124–150, 2018. Disponível em: https://gssrr.org/JournalOfBasicAndApplied/article/view/9242. Acesso em: 12 sep. 2025.