Firek, W. Assessment of the Quality of Instructional Support of Players by the Referee During children’s Rugby Competitions. In Contemporary problems of physical and health culture; Kowalska, J. E., Makarczuk, A., Maszorek-Szymala, A., Kaźmierczak, A., Eds.; Lodz University Press: Poland, 2022; pp. 95-109. https://doi.org/10.18778/8220-945-7.07.