Christine Lochner, Sian M.J. Hemmings, Craig J. Kinnear, Dana J.H. Niehaus, Daniel G. Nel, Valerie A. Corfield, Johanna C. Moolman-Smook, Soraya Seedat & Dan J. Stein. Cluster analysis of obsessive-compulsive spectrum disorders in patients with obsessive-compulsive disorder: clinical and genetic correlates. „Comprehensive Psychiatry”. 46, s. 14 – 19, 2005. science direct. Elsevier. DOI: 10.1016/j.comppsych.2004.07.020. (ang.).
Christenson GA, Pyle RL, Mitchell JE.. Estimated lifetime prevalence of trichotillomania in college students.. „The Journal of Clinical Psychiatry”. 52, s. 415-7, 1991. PMID: 1938977. (ang.).