Alava, J. B. C., L. E. A. Vera, V. F. Tipán, and G. V. L. Pinargote. “Problem-Based Learning As a Methodological Strategy in the Teaching-Learning Process”. International Journal of Social Sciences and Humanities, vol. 5, no. 3, Dec. 2021, pp. 232-4, doi:10.53730/ijssh.v5n3.2028.