Peterson,B. S.,Pine,D. S.,Cohen,P.,& Brook,J. S. (2001). Prospective longitudinal study of tic,obsessive/ compulsive and attention deficit hyperactivity disorders in an epidemiological sample. Journal of the American Academy of Child and Adolescent Psychiatry,40,685-695.

Peterson,B. S.,Pine,D. S.,Cohen,P.,& Brook,J. S. (2001). Prospective longitudinal study of tic,obsessive/ compulsive and attention deficit hyperactivity disorders in an epidemiological sample. Journal of the American Academy of Child and Adolescent Psychiatry,40,685-695.