“Operational Surveillance of Security Service over Sports Movement in People’s Republic of Poland in the 80’s”. Sport i Turystyka Środkowoeuropejskie Czasopismo Naukowe 15, no. 2 (April 7, 2019): 63–76. Accessed September 23, 2026. https://czasopisma.ujd.edu.pl/index.php/sport/article/view/379.