Pongoh, Tonny, Henry Soelistyo Budi, und Bintan R. Saragih. „Rethinking Legal Status of Polytechnic in the Law of Education System“. Global Legal Review 1, no. 2 (Oktober 28, 2021): 105–124. Zugegriffen November 20, 2025. https://ojs.uph.edu/index.php/GLR/article/view/4037.