TJAHYADI, E. The Interplay of Promotional Strategies and Service Quality in Fostering Customer Loyalty: An Empirical Study of Indonesia’s E-Commerce Duopoly of Tokopedia vs. Shopee. Eduvest - Journal of Universal Studies, [S. l.], v. 6, n. 3, p. 4194–4211, 2026. DOI: 10.59188/eduvest.v6i3.52453. Disponível em: https://eduvest.greenvest.co.id/index.php/edv/article/view/52453. Acesso em: 31 may. 2026.