“Marketing Strategies in Informal Business: Media of Promotion and Advertising”. FACE: Revista de la Facultad de Ciencias Económicas y Empresariales 23, no. 3 (September 26, 2023): 142–154. Accessed October 16, 2025. https://ojs.unipamplona.edu.co/index.php/face/article/view/2624.