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Schramm, Elisabeth, Martin Hautzinger, Ingo Zobel, Levente Kriston, Mathias Berger, and Martin Härter. Comparative Efficacy of the Cognitive Behavioral Analysis System of Psychotherapy Versus Supportive Psychotherapy for Early Onset Chronic Depression: Design and Rationale of a Multisite Randomized Controlled Trial. BioMed Central, 2011.

Schramm, Elisabeth, et al. Comparative Efficacy of the Cognitive Behavioral Analysis System of Psychotherapy Versus Supportive Psychotherapy for Early Onset Chronic Depression: Design and Rationale of a Multisite Randomized Controlled Trial. BioMed Central, 2011.