WILLIE, Michael Mncedisi. Optimizing Marketing Strategies and Expenses in Medical Schemes, South Africa: Challenges and Solutions. Golden Ratio of Marketing and Applied Psychology of Business, [S. l.], v. 4, n. 2, p. 109–111, 2024. DOI: 10.52970/grmapb.v4i2.445. Disponível em: https://www.goldenratio.id/index.php/grmapb/article/view/445. Acesso em: 21 apr. 2026.