Szelhaus, Stanisław. “The Delinquency of 100 Recidivists During a Period from the Age of 18 to 25th-28th Year of Age (Results of the Follow-up Studies)”. Archives of Criminology, no. III (January 1, 1965): 97–120. Accessed September 25, 2023. https://czasopisma.inp.pan.pl/index.php/ak/article/view/746.