Piyasirikul, Kampol. 2015. “Questions about the Study of Cai Yuanpei and Peking University Before and After the May Fourth Movement : A Revision Based on Primary Historical Materials”. Journal of Sinology (วารสารจีนวิทยา) 9 (August):130-52. https://so16.tci-thaijo.org/index.php/JSINO/article/view/2872.