Xu, Siyu, Yuan-Cheng Chang, and Hu Gao. “Principal Support on Teacher Professional Development and Mediating Role of Career Calling: Higher Education Vocational College Teachers Perceptions”. International Journal of Learning, Teaching and Educational Research 23, no. 7 (July 30, 2024): 186–206. Accessed April 30, 2026. http://www.ijlter.net/index.php/ijlter/article/view/1999.