HAJN, Zbigniew. Protection of Whistleblowers in the Workplace. Who Is Protected and Who Is Responsible under the Provisions of the EU Directive 2019/1937?. W: SKUPIEŃ, Dagmara (red.). Towards a Better Protection of Workplace Whistleblowers in the Visegrad Countries, France and Slovenia. PrawoPoland: Wydawnictwo Uniwersytetu Łódzkiego,2021. p. 29–47. DOI: 10.18778/8220-639-5.03. Disponível em: https://www.press.uni.lodz.pl/index.php/wul/catalog/book/468/chapter/1321. Acesso em: 14 luty. 2026.