KOTTLER, Jeffery A.; UHLEMANN, Max R. Working with Difficult Clients: A Neglected Area of Study. Canadian Journal of Counselling and Psychotherapy, [S. l.], v. 28, n. 1, 2007. Disponível em: https://cjc-rcc.ucalgary.ca/article/view/58489. Acesso em: 5 dec. 2025.