HERGENROEDER, E.; VACULÍK, J. A COMMUNICATION PROBLEM – TO TRY TO SOLVE IT. Perner’s Contacts, [S. l.], v. 3, n. 1, 2008. Disponível em: https://pernerscontacts.upce.cz/index.php/perner/article/view/1204. Acesso em: 17 kvě. 2024.