ABDELKADER, M.; HARZELLIHALA, H.; AOUATEF, A. Customer relationship management as a gateway to improve marketing performance of tourism agencies in the State of Biskra. International journal of economic perspectives, [S. l.], v. 19, n. 4, p. 1431–1453, 2025. Disponível em: https://ijeponline.org/index.php/journal/article/view/967. Acesso em: 31 may. 2026.