Moskal, Anna, Aleksandra Sobarnia, Szymon Pazera, и Zuzanna Kopania, ред. 2021. The European Union in light of the COVID-19 Pandemic ‒ A Failure of European Integration or a Chance for Closer Cooperation among Member States?. Poland: Księgarnia Akademicka Publishing. https://doi.org/10.12797/9788381385763.