DO MINH, Hoang; TRAN HOAI, Nam. Referral Reward Program Influence on Customer Engagement: The Role of Reward Type and Task Complexity. Golden Ratio of Marketing and Applied Psychology of Business, [S. l.], v. 6, n. 2, p. 335–352, 2026. DOI: 10.52970/grmapb.v6i2.1807. Disponível em: https://www.goldenratio.id/index.php/grmapb/article/view/1807. Acesso em: 28 feb. 2026.