Powers, M. B., Smits, J. A. J., Otto, M. W., Sanders, C., & Emmelkamp, P. M. G. (2009). Facilitation of fear extinction in phobic participants with a novel cognitive enhancer: a randomized placebo controlled trial of yohimbine augmentation. Journal of Anxiety Disorders, 23(3), 350-356. https://doi.org/10.1016/j.janxdis.2009.01.001

Powers, M. B., Zum Vörde Sive Vörding, M. B., & Emmelkamp, P. M. G. (2009). Acceptance and commitment therapy: a meta-analytic review. Psychotherapy and Psychosomatics, 78(2), 73-80. https://doi.org/10.1159/000190790

Schuppert, H. M., Giesen-Bloo, J., van Gemert, T. G., Wiersema, H. M., Minderaa, R. B., Emmelkamp, P. M. G., & Nauta, M. H. (2009). Effectiveness of an emotion regulation group training for adolescents: a randomized controlled pilot study. Clinical Psychology and Psychotherapy, 16(6), 467-478. https://doi.org/10.1002/cpp.637

Schuurmans, J., Comijs, H., Emmelkamp, P. M. G., Weijnen, I. J. C., van den Hout, M., & van Dyck, R. (2009). Long-term effectiveness and prediction of treatment outcome in cognitive behavioral therapy and sertraline for late-life anxiety disorders. International Psychogeriatrics, 21(6), 1148-1159. https://doi.org/10.1017/S1041610209990536

Vedel, E., & Emmelkamp, P. (2009). Effectieve psychologische interventies. In I. Franken, & W. van den Brink (Eds.), Handboek verslaving (pp. 387-410). De Tijdstroom.

Visser, S., & Emmelkamp, P. (2009). ACT revisited: hoe evidence-based is de Acceptance and Commitment Therapy? Psychopraxis, 11(4), 160-163.

Liber, J. M., Utens, E. M. W. J., van der Leeden, A. J. M., & Treffers, P. D. A. (2009). Individuele behandeling of groepsbehandeling: is er verschil? Kind en Adolescent, 30(3), 181-194.

Aas, B. G., Meyerbröker, K., & Emmelkamp, P. M. G. (2009). Who am I - and if so, where? An experiment on personality in online virtual realities. In Proceedings of the SLACTIONS 2009 International Conference (pp. 28-38)

Emmelkamp, P. M. G., Bouman, T. K., & Visser, S. (2009). Angststoornissen en hypochondrie: diagnostiek en behandeling. Bohn Stafleu van Loghum.

Anholt, G. E., van Oppen, P., Emmelkamp, P. M. G., Cath, D. C., Smit, J. H., van Dyck, R., & van Balkom, A. J. L. M. (2009). Measuring obsessive-compulsive symptoms: Padua Inventory-Revised vs. Yale-Brown Obsessive-Compulsive Scale. Journal of Anxiety Disorders, 23(6), 830-835. https://doi.org/10.1016/j.janxdis.2009.04.004