Meta-meta analysis: a new method for evaluating therapy outcome.

[1]  M. L. Smith,et al.  Meta-analysis of psychotherapy outcome studies. , 1977, The American psychologist.

[2]  L Luborsky,et al.  Comparative studies of psychotherapies: is it true that "everybody has won and all must have prizes"? , 1975, Proceedings of the annual meeting of the American Psychopathological Association.