Margalina, Vasílica María, and Juan Pablo Martínez. “Economic Concentration in the Province of Tungurahua”. Bolentín de Coyuntura, no. 9 (June 30, 2016): 12–13. Accessed July 22, 2024. https://revistas.uta.edu.ec/erevista/index.php/bcoyu/article/view/598.