“Ewa Łętowska, Wzorce umowne. Ogólne warunki. Wzory. Regulaminy. [Les modèles contractuels. Conditions générales. Modèles. Règlements], Wrocław 1975, Ossolineum” (1977) Contemporary Central & East European Law, (1 (33), pp. 47–49. Available at: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1454 (Accessed: 6 October 2025).