BACHÁ MÉNDEZ, G. Acquisition of an operant response in presence of an alternative source: Contrafreeloading. Mexican Journal of Behavior Analysis, [S. l.], v. 28, n. 1, p. 91–104, 2011. DOI: 10.5514/rmac.v28.i1.23555. Disponível em: https://revistas.unam.mx/index.php/rmac/article/view/23555. Acesso em: 29 apr. 2024.