Sukiennik, Jakub, Sławomir Czetwertyński, Paula Przysada-Sukiennik, and Agnieszka Mroczek-Czetwertyńska. 2024. “Institutional Differences and Threats to International Tourists from the Perspective of New Institutional Economics”. Research Papers in Economics and Finance 8 (1). https://doi.org/10.18559/ref.2024.1.914.