DZIECHCIARZ, Józef. Professor Zdzisław Hellwig 1925 – 2013. Renaissance style giant. Acta Universitatis Lodziensis. Folia Oeconomica, [S. l.], v. 3, n. 314, 2016. DOI: 10.18778/0208-6018.314.10. Disponível em: https://czasopisma.uni.lodz.pl/foe/article/view/592. Acesso em: 6 dec. 2025.