Chen, Yuexi, Hanyue Sun, and Yang Wang. “A Study on the Design of a Performance Bond for After-School Tutoring Institutions’ Prepaid Consumption”. Journal of Humanities and Nature 1, no. 2 (August 16, 2025). Accessed August 26, 2025. https://www.hkemasia.com/index.php/jhn/article/view/44.