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. Contemporary Central & East European Law, [S. l.], n. 15, p. 47–50, 1971. Disponível em: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1510. Acesso em: 6 oct. 2025.