RIBES, E.; DAZA, B. C.; LÓPEZ, F.; RAMÍREZ, P. Effects of non-contingent and delayed reinforcement on two concurrent responses. Mexican Journal of Behavior Analysis, [S. l.], v. 4, n. 2, 2011. DOI: 10.5514/rmac.v4.i2.23665. Disponível em: https://revistas.unam.mx/index.php/rmac/article/view/23665. Acesso em: 5 may. 2024.