Sprengel, Bolesław. “Forgeries of Money (banknotes and coins), Chequebooks and Saving Account Books in Poland in1918-1939”. Archives of Criminology, no. XXXIV (January 1, 2012): 569–601. Accessed April 1, 2023. https://czasopisma.inp.pan.pl/index.php/ak/article/view/121.