Principles and Criteria for Classifying Commercial Centers in Cities (An Applied Study on Erbil City). Twejer Journal, Soran, Kurdistan regional Government,Iraq, v. 8, n. 3, p. 306–336, 2025. DOI: 10.31918/twejer.2583.13. Disponível em: https://journals.soran.edu.iq/index.php/Twejer/article/view/1562. Acesso em: 9 nov. 2026.