Zulema Izamar Peña Alvarez, Sonia Jannet Peña Alvarez,. “Investigating Skill-Based Constraints in the TOEFL Test: A Quantitative Study of University EFL Learners in Ecuador, South America”. Journal of Daoist Studies, vol. 19, no. S8, July 2026, pp. 205-18, https://journalofdaoiststudies.org/index.php/journal/article/view/1430.