PIPKIN, G.; LENT, R. C. At the Schoolhouse Gate: Lessons in Intellectual Freedom. Education Review, [S. l.], 2015. DOI: 10.14507/er.v0.221. Disponível em: https://edrev.asu.edu/index.php/ER/article/view/221. Acesso em: 3 may. 2024.