Kühnis, J., Wachter, B. and Frommelt, C. (2016) “Involvement in Sports Clubs and Informal Sport Activities of Primary and Secondary School Children in Liechtenstein”, Revija za elementarno izobraževanje, 9(1/2), p. 10 f. Available at: https://journals.um.si/index.php/education/article/view/370 (Accessed: 6 December 2025).