MCMANUS, Hanna. The concept of motivation and the problem of motivational barriers in foreign language learning. Scripta Neophilologica Posnaniensia, [S. l.], n. 6, p. 173–186, 2018. DOI: 10.14746/snp.2004.06.10. Disponível em: https://pressto.amu.edu.pl/index.php/snp/article/view/14029. Acesso em: 29 lis. 2024.