Sung-Sik Yoo, Jun-Hyeok Seo, Soo-Yong Park, Dong-Hyung Lee. “Development Plan of Private Vocational Competency Development Training Institutes”. Journal for ReAttach Therapy and Developmental Diversities 6, no. 9s(2) (August 26, 2023): 606–617. Accessed July 3, 2024. https://jrtdd.com/index.php/journal/article/view/1290.