“The Sports Badge “Fit For Work and Defence” (‘Sprawny Do Pracy I Obrony’ – SPO). The Characteristics and Principles of Earning It on the Example of Sports Associations in Rzeszów Voivodship in 1953 ”. 2020. Sport I Turystyka Środkowoeuropejskie Czasopismo Naukowe 3 (4): 79-96. https://doi.org/10.16926/sit.2020.03.30.