Jan Skupiński, Model polskiego prawa o wykroczeniach [Le modèle du droit polonais en matière de contraventions], Warszawa 1974, Ossolineum. Contemporary Central & East European Law, [S. l.], n. 4 (28), p. 42–43, 1975. Disponível em: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1360. Acesso em: 6 oct. 2025.