National Institute of Mental Health. Treatment of Depression Collaborative Research Program: General Effectivness of treatment. - Elkin,I.; Shea,T.; Watkins,J.T.; Imber,S.S.; Sotsky,S.M.; Collins,J.F.; Glass,D.R.; Pilkonis,P.A.; Leber,W.R.; Docherty,J.P.; Fiester,S.J.; Parloff,M.B. (Archives of General Psychiatry, 1989)