Szewczyk, Agnieszka, and Elżbieta Skrzypek. “Crowdfunding: Motivation and a Measure of Social Energy in International Context”. Journal for Perspectives of Economic Political and Social Integration 32, no. 1 (June 30, 2026): 177–219. Accessed July 8, 2026. https://czasopisma.tnkul.pl/index.php/jpepsi/article/view/5146.