FIREK, Wiesław. Assessment of the quality of instructional support of players by the referee during children’s rugby competitions. In: KOWALSKA, Jolanta Elżbieta; MAKARCZUK, Anna; MASZOREK-SZYMALA, Anna; KAŹMIERCZAK, Arkadiusz (eds.). Contemporary problems of physical and health culture. Poland: Lodz University Press,2022. p. 95–109. DOI: 10.18778/8220-945-7.07. Disponível em: https://www.press.uni.lodz.pl/index.php/wul/catalog/book/1255/chapter/3620. Acesso em: 29 jan. 2026.