Wierzbicka, Wioletta, and Zuzanna Kalitka. “Budget Revenues in Poland During the Financial Crisis of 2007 and the Covid-19 Pandemic”. Olsztyn Economic Journal 18, no. 1 (June 30, 2023): 39–50. Accessed July 22, 2024. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/9543.