J. Kühnis, B. Wachter, in C. Frommelt, „Involvement in Sports Clubs and Informal Sport Activities of Primary and Secondary School Children in Liechtenstein“, REI, let. 9, št. 1/2, str. 10 f., maj 2016, Pridobljeno: 8. november 2025. [Na spletu]. Dostopno na: https://old.journals.um.si/index.php/education/article/view/370