Igor Andrejew, Rozpoznanie znamion przestępstwa [Identification of the Features of Crime], Warszawa 1969, PWN, 160 pages. Contemporary Central & East European Law, [S. l.], n. 15, p. 39–42, 1971. Disponível em: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1507. Acesso em: 6 oct. 2025.