W. Brzeziński, I. Kaleta, L. Martan, M. Weralski: Problemy prawne planowania gospodarczego [Legal Aspects of Economic Planning], Warszawa 1964, PWN. Contemporary Central & East European Law, [S. l.], n. 6, p. 53–55, 1966. Disponível em: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1732. Acesso em: 6 oct. 2025.