Dziechciarz, Józef. “Professor Zdzisław Hellwig 1925 – 2013. Renaissance Style Giant”. Acta Universitatis Lodziensis. Folia Oeconomica 3, no. 314 (February 29, 2016). Accessed December 6, 2025. https://czasopisma.uni.lodz.pl/foe/article/view/592.