The Effect of Gray Marketing on Brand Value from the Perspective of Customers: A Field Study on Users of International Sports Brands in Cairo Governorate. The Arab Journal of Administration, Cairo, v. 45, n. 5, p. 303–332, 2025. DOI: 10.21608/aja.2025.334960.1745. Disponível em: https://ajajournal.org/index.php/aja/article/view/822. Acesso em: 12 jun. 2026.