Chang, Chunying, Jiabao Zhai, Die Hu, and Yanan Zheng. “Insomnia Among Vocational College Students in China: Status and Influencing Factors”. South African Journal of Psychiatry 32, no. 1 (February 17, 2026). Accessed November 9, 2026. https://www.ajol.info/index.php/sajpsyc/article/view/317450.