Malchrowicz-Mośko, E., J. Poczta, and M. Młodzik. “Motivations of Inhabitants of Large Urban Agglomerations to Participate in Mass Running Events”. Journal of Education, Health and Sport, vol. 7, no. 6, June 2017, pp. 431-46, https://apcz.umk.pl/JEHS/article/view/4554.