Korcz, A., Bronikowska, M., Laudanska-Krzeminska, I., Borowiec, J., Ludwiczak, M., & Bronikowski, M. (2018). Is social support during physical education lessons associated with body mass index status, gender and age?. South African Journal for Research in Sport, Physical Education and Recreation, 40(2), 53–68. https://doi.org/10.4314/sajrs.v40i2.