NIETO, J.; CABRERA, R. Learning of a response-reinforcer contingency by observer pigeons. Mexican Journal of Behavior Analysis, [S. l.], v. 28, n. 2, p. 157–172, 2011. DOI: 10.5514/rmac.v28.i2.26327. Disponível em: https://journals.unam.mx/index.php/rmac/article/view/26327. Acesso em: 4 jul. 2024.