KORONCZEWSKI, A. Gerd Hentschel, Vokalperzeption und naturliche Phonclogie. Polonica, [S. l.], v. 15, p. 178–180, 1990. Disponível em: https://polonica.ijp.pan.pl/index.php/polonica/article/view/524. Acesso em: 3 grudz. 2024.