„EFFECTIVENESS OF MARKETING-MIX STRATEGIES ON CUSTOMERS OF FITNESS ESTABLISHMENTS. PILOT AND PRELIMINARY STUDY IN THE CITY OF YAOUNDE (CAMEROON)”, Revue ISG, vol. 5, nr. 2, mai 2022, Data accesării: oct. 23, 2026. Disponibil la: https://www.revue-isg.com/index.php/home/article/view/913