DJOUBEROU , Jean-Louis, Victor SAIDOU, and FOUDA OMGBA NSI André Landry. 2022. “EFFECTIVENESS OF MARKETING-MIX STRATEGIES ON CUSTOMERS OF FITNESS ESTABLISHMENTS. PILOT AND PRELIMINARY STUDY IN THE CITY OF YAOUNDE (CAMEROON)”. Revue Internationale Des Sciences De Gestion 5 (2). https://revue-isg.com/index.php/home/article/view/913.