“W. Brzeziński, I. Kaleta, L. Martan, M. Weralski: Problemy prawne planowania gospodarczego [Legal Aspects of Economic Planning], Warszawa 1964, PWN” (1966) Contemporary Central & East European Law, (6), pp. 53–55. Available at: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1732 (Accessed: 6 October 2025).