Carkhuff, Robert R. (1969). Helping and Human Relations: A Primer for Lay and Professional Helpers. (Volume 1). Canadian Journal of Counselling and Psychotherapy, [S. l.], v. 5, n. 1, 2012. Disponível em: https://jmss.org/index.php/rcc/article/view/60737. Acesso em: 24 oct. 2026.