LEFFLER, T. Kämpfen im Sportunterricht. Journal of Martial Arts Research, [S. l.], v. 2, n. 3, p. 8, 2019. DOI: 10.15495/ojs_25678221_23_125. Disponível em: https://ojs.uni-bayreuth.de/index.php/jomar/article/view/125. Acesso em: 21 okt. 2020.