CLELAND, C. C.; PHILLIPS, B. N. Birth order and mental deficiency in institutionalized retardates. Revista Interamericana de Psicología/Interamerican Journal of Psychology, [S. l.], v. 2, n. 2, 2017. DOI: 10.30849/rip/ijp.v2i2.513. Disponível em: http://sip2013.sipsych.org/ojs-/index.php/IJP/article/view/513. Acesso em: 5 apr. 2026.