Nieto, Javier, and Robert A. Boakes. “Approach and Withdrawal Behavior in Pavlovian Aversive Conditioning in the PigeonI”. Mexican Journal of Behavior Analysis 1, no. 1 (August 25, 2011): 173–194. Accessed April 26, 2024. https://revistas.unam.mx/index.php/rmac/article/view/26911.