Z. Hajn, „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, D. Skupień, Red. Poland: Wydawnictwo Uniwersytetu Łódzkiego, 2021, s. 29–47. doi: 10.18778/8220-639-5.03.