Gardner, K. R. and Montgomery, P.S. (1977). Clinical Biofeedback: A Procedural Manual. Canadian Journal of Counselling and Psychotherapy, [S. l.], v. 12, n. 4, 2012. Disponível em: https://jmss.org/index.php/rcc/article/view/60204. Acesso em: 25 oct. 2026.