HAGEN, B.; GUNN, T. The Placebo Effect and Learning: Implications for Counsellors. Canadian Journal of Counselling and Psychotherapy, [S. l.], v. 40, n. 4, 2007. Disponível em: https://cjc-rcc.ucalgary.ca/article/view/58786. Acesso em: 23 apr. 2024.