Ribes, Emilio, and Carlos Torres. “Effects of Varying the Probability of Reinforcement Correlated With Two Neutral Stimuli in a Temporally Defined Schedule”. Mexican Journal of Behavior Analysis 22, no. 1 (January 25, 2011): 41–78. Accessed May 17, 2024. https://revistas.unam.mx/index.php/rmac/article/view/23492.