Seweryniak, Tomasz, Justyna Muracka, and Aneta Stosik. 2016. “Kompetencje trenerów pływania W Opinii trenerów-ekspertów = Swimming Coaches Competences in the Opinion of Expert Coaches”. Journal of Education, Health and Sport 6 (9):236-47. https://apcz.umk.pl/JEHS/article/view/3813.