Lang, Grazia, Sarah Piller, Jürg Schmid, Markus Lamprecht, and Siegfried Nagel. “Professionalization and Organizational Problems of Sports Clubs: Is There a Relationship?”. Current Issues in Sport Science (CISS) 7 (October 17, 2022): 004. Accessed February 23, 2025. https://ciss-journal.org/article/view/8220.