GIRMA, Desalegn; ZELEKE TIRKASO SHALLA. Internal Factors Affecting Contractor’s Performance and the Improvement Mechanisms. Ethiopian Journal of Engineering and Technology, Ethiopia, v. 2, p. 149–168, 2023. DOI: 10.82127/s3ev5170. Disponível em: https://journals.hu.edu.et/hu-journals/index.php/ejet/article/view/926.. Acesso em: 20 may. 2026.