ŠALKAUSKAS, A. The Lithuanian SSR students’ practical activity and knowledge of the field of environmental protection. Psichologija, [S. l.], v. 9, n. 2, p. 105–116, 1968. DOI: 10.15388/Psichol.1968.9.8936. Disponível em: https://test.zurnalai.vu.lt/psichologija/article/view/8936. Acesso em: 26 oct. 2025.