SEKIDA, Marcin; MALCHROWICZ-MOŚKO, Ewa. Turystyka ekstremalna vs. sporty ekstremalne = Tourism extreme vs. extreme sports. Journal of Education, Health and Sport, [S. l.], v. 6, n. 12, p. 666–679, 2016. Disponível em: https://apcz.umk.pl/JEHS/article/view/4112. Acesso em: 12 feb. 2025.