Varela Juárez, Ricardo, Tomás Cuevas Contreras, and Sergio Salmerón Manzanares. “Effects of the Tip on the Socio-Economy and the Human”. Noesis. Journal of Social Sciences and Humanities 24, no. 47-1 (September 10, 2021): 49–68. Accessed September 14, 2026. http://148.210.21.18/ojs/index.php/noesis/article/view/651.