MANSELL, W. Method of Levels: Is it the Most Parsimonious Psychological Therapy Available?. Revista de Psicoterapia, [S. l.], v. 29, n. 110, p. 135–143, 2018. Disponível em: https://revistas.uned.es/index.php/rdp/article/view/34950. Acesso em: 31 ene. 2023.