Lewandowski, Andrzej, Aleksandra Siedlaczek, Marcin Siedlaczek, and Ryszard Grucza. “Changes in the Physical Fitness of Volleyball Players”. Medical and Biological Sciences 26, no. 4 (June 23, 2012): 85–89. Accessed January 27, 2026. https://apcz.umk.pl/MBS/article/view/v10251-012-0075-x.