Marcos, José L. 2001. Relation between conditioned stimulus-elicit responses and unconditioned response diminution in long -interval human heart-rate classical conditioning. The Spanish Journal of Psychology 4, 1, 11. Recuperado 6 de diciembre de 2025 a partir de https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0101120011A