The Causes of Variation Orders and Their Effects on Cost and Time of Projects in Sulaimani Governorate. Kurdistan Journal of Applied Research, [S. l.], v. 5, n. 1, p. 218–235, 2020. DOI: 10.24017/science.2020.1.16. Disponível em: https://kjar.spu.edu.iq/index.php/kjar/article/view/482.. Acesso em: 8 aug. 2025.