Sieroń, A., G. Kołodyńska, and P. Rostojek. “Potential Advantages and Disadvantages of Using Creatine Supplements by Professional Volleyball Players”. Journal of Education, Health and Sport, vol. 8, no. 8, Aug. 2018, pp. 1078-87, https://apcz.umk.pl/JEHS/article/view/6009.