COULSON, G.; KOFFER, K.; COULSON, V.; WENT, H. Positive Reinforcement as a Correlation Between Lever Pressing and Inerease in Frequency of food Pellet Delivery in rats. Mexican Journal of Behavior Analysis, [S. l.], v. 2, n. 2, p. 165–175, 2011. DOI: 10.5514/rmac.v2.i2.25267. Disponível em: https://revistas.unam.mx/index.php/rmac/article/view/25267. Acesso em: 14 may. 2024.