“Zygmunt Rybicki: Rady delegatów Robotniczych W Polsce 1918-1919, Warszawa 1962, PWN”. Contemporary Central & East European Law, no. 2 (December 31, 1963): 17–18. Accessed October 8, 2025. https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1645.