Moskal, Anna, Aleksandra Sobarnia, Szymon Pazera, i Zuzanna Kopania, red. „I. The Historical Development of European Integration . 27”. W 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: Wydawnictwo Księgarnia Akademicka, 2021. Dostęp styczeń 1, 2026. https://books.akademicka.pl/publishing/catalog/book/273/chapter/5808.