A. Moskal, A. Sobarnia, S. Pazera, и Z. Kopania, ред., «Introduction .......... 19», в 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, 2021, сс. 19–25. doi: 10.12797/9788381385763.01.