Moskal, Anna, Aleksandra Sobarnia, Szymon Pazera, и Zuzanna Kopania, ред. «I. The Historical Development of European Integration . 27». 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?, 27–48. Poland: Księgarnia Akademicka Publishing, 2021. просмотрено ноябрь 5, 2026. https://books.akademicka.pl/publishing/catalog/book/273/chapter/5808.