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://cdm.ucalgary.ca/index.php/rcc/article/view/58489. Acesso em: 4 jan. 2026.