ŠAPOKIENĖ, E. The organization of enviroment protection in Lithuanian SSR schools. Psichologija, [S. l.], v. 8, p. 77–89, 1966. DOI: 10.15388/Psichol.1966.8.9300. Disponível em: https://www.journals.vu.lt/psichologija/article/view/9300. Acesso em: 6 dec. 2025.