Stanuch, Marcin, and Krzysztof Adam Firlej. “Forecasting the Development of Electricity from Renewable Energy Sources in Poland Against the Background of the European Union Countries”. Czasopismo "Economics and Environment" 84, no. 1 (May 13, 2023): 30–50. Accessed October 8, 2025. https://ekonomiaisrodowisko.pl/journal/article/view/536.