Butterfield, L. D., A.-S. T. Maglio, W. A. Borgen, and N. E. Amundson. “Using the Enhanced Critical Incident Technique in Counselling Psychology Research”. Canadian Journal of Counselling and Psychotherapy, vol. 43, no. 4, Nov. 2009, https://cjc-rcc.ucalgary.ca/article/view/58863.