Roczniak, K., Babuśka–Roczniak, M., Wojtanowska–Kaczka, M., Racz, O., Roczniak, A., Lyubinets, O., Widuchowski, W. and Roczniak, W. (2020) “Morphological and motor skills condition among 10-11 year old children engaged in cross-country skiing attending Sports Primary School in Suprasl”, Journal of Education, Health and Sport, 10(6), pp. 68–81. doi: 10.12775/JEHS.2020.10.06.007.