Kothari, R., Barker, C., Pistrang, N., Rozental, A., Egan, S., Wade, T., … Shafran, R. (2019). A randomised controlled trial of guided internet-based cognitive behavioural therapy for perfectionism: Effects on psychopathology and transdiagnostic processes. Journal of Behavior Therapy and Experimental Psychiatry, 64, 113-122. https://doi.org/10.1016/j.jbtep.2019.03.007