Liu, Y. ., . F. . Khalid, and N. M. . Nasri. “An Investigation into College English Teaching and 4C Skills Development: A Case Study of Higher Education in China”. International Journal of Learning, Teaching and Educational Research, vol. 24, no. 12, Dec. 2025, pp. 451-73, http://ijlter.myres.net/index.php/ijlter/article/view/2630.