Müller, Anetta, S. Bolega, Zoltán Gabnai, Éva Bácsné Bába, and Christa Pfau. “Motivational Factors of Choosing BMX and Other Extreme Sports”. International Journal of Engineering and Management Sciences 3, no. 4 (September 30, 2018): 426–441. Accessed April 27, 2024. https://ojs.lib.unideb.hu/IJEMS/article/view/5098.