“Leon Tyszkiewicz, Doktryny i ruch "Obrony społecznej" we współczesnym prawie karnym [Doctrines and the Movement of ‘Social Defense’ in Modern Penal Law], Poznań 1968, 343 pages, Adam Mickiewicz University, Publication of the Law Department”, CC&EEL, no. 15, pp. 47–50, Dec. 1971, Accessed: Oct. 06, 2025. [Online]. Available: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1510