“Marketing Strategies for Customer Loyalty in Three Supermarkets in 2024, Located in the City of Estelí, Nicaragua”. Revista Científica Estelí 14, no. 53 (April 25, 2025): 89–111. Accessed August 6, 2025. https://revistas.unan.edu.ni/index.php/Cientifica/article/view/5026.