Retana de Alemán, Jasmín Rocío, and Edwin Stwart Síntigo Vásquez. “Factors Influencing the Quality of School Footwear Manufactured by Companies in El Salvador”. Anuario de Investigación: Universidad Católica de El Salvador 13, no. 1 (January 24, 2025): 75–86. Accessed April 11, 2026. https://www.camjol.info/index.php/aiunicaes/article/view/19907.