Naber, D., Weinberger, D. R., Bullinger, M., Polsby, M., & al., et. (1988). Personality variables, neurological and psychopathological symptoms in patients suffering from spasmodic torticollis. Comprehensive Psychiatry, 29(2), 182–187. http://www.harcourthealth.com/scripts/om.dll/serve?action=searchDB\&searchDBfor=home\&id=comp