Žuljević, D., and V. Gavrilov-Jerković. “Processes of Change Assessed by PCQ 2001: A Step Back or Forth in Understanding Psychotherapeutic Change”. Primenjena Psihologija, vol. 1, no. 1-2, Mar. 2008, pp. 95-115, doi:10.19090/pp.2008.1-2.95-115.