Kühnis, Jürgen, Beat Wachter, and Christian Frommelt. “Involvement in Sports Clubs and Informal Sport Activities of Primary and Secondary School Children in Liechtenstein”. Journal of Elementary Education 9, no. 1/2 (May 15, 2016): 10 f. Accessed December 22, 2024. https://journals.um.si/index.php/education/article/view/370.