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 Towards a Better Protection of Workplace Whistleblowers in the Visegrad Countries, France and Slovenia, zredagowane przez Dagmara Skupień, 29–47. Prawo. Poland: Wydawnictwo Uniwersytetu Łódzkiego, 2021. Dostęp styczeń 23, 2026. https://www.press.uni.lodz.pl/index.php/wul/catalog/book/468/chapter/1321.