Y. Y. Krisdianata, R. Larasati, P. Saengthien, and S. Kosanwattana, “Integrating Project-Based Learning in English for Ecotourism and Hospitality: A Descriptive Analysis of Student Outcomes”, Saengtham Coll. J., vol. 17, no. 2, pp. 135–156, Dec. 2025.