Le, Thi Nhan Duyen, and Buu Huan Nguyen. 2017. “Factors Influencing Group Work of Students in Learning English As a Foreign Language (EFL): A Case Study at a Vietnamese University”. CTU Journal of Innovation and Sustainable Development, no. 06 (July):9-16. https://doi.org/10.22144/ctu.jen.2017.021.