Pulido, Marco Antonio, Leticia López, and Nuria Lanzagorta. “Effects of Contingent and Non-Contingent Signals During Delay Interval on Response Acquisition by Rats”. Mexican Journal of Behavior Analysis 31, no. 2 (January 24, 2011): 227–244. Accessed May 14, 2024. https://revistas.unam.mx/index.php/rmac/article/view/23247.