Kwapis, Robert. “The Genesis of the Spring of Prague (Czechoslovakia in the Years 1948-1966)”. Acta Universitatis Lodziensis. Folia Historica, no. 65 (January 1, 1999): 159–174. Accessed December 7, 2025. https://czasopisma.uni.lodz.pl/historica/article/view/21645.