POLYANSKAYA, E. N.; SHILOVA, T. A.; TYUTCHENKO, A. M. Persistence and initiative: system-functional approach. Amazonia Investiga, [S. l.], v. 8, n. 22, p. 363–369, 2019. Disponível em: https://amazoniainvestiga.info/index.php/amazonia/article/view/622. Acesso em: 3 jul. 2024.