A. Müller, S. Bolega, Z. Gabnai, Éva Bácsné Bába, and C. Pfau, “Motivational Factors of Choosing BMX and Other Extreme Sports”, IJEMS, vol. 3, no. 4, pp. 426–441., Sep. 2018, doi: 10.21791/IJEMS.2018.4.35.