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Differential responses to psychotherapy versus pharmacotherapy in patients with chronic forms of major depression and childhood trauma. Nemeroff, Heim, Thase. PNAS. vol. 100 no. 24,14293–14296.
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You might also find this article helpful as well, a comprehensive review of Humanistic Psychotherapy empirical research findings over the past 25 years -see reference below. The manuscript provides a summary of core principles of Humanistic Therapy practice and strong quantitative , meta-analytic outcome findings for Humanistic Psychotherapy of MDD and overall treatment efficacy. The online version of this manuscript was published in December and is available for review on my researchgate profile.
Humanistic psychotherapy research 1990-2015: From methodological innovation to evidence-supported treatment outcomes and beyond. (2014) Angus, L. , Watson, J., Elliott, R., Schneider, K. and Timulak, L. Psychotherapy Research. DOI: 10.1080/10503307.2014.989290.