Bockting, C., Schene A., Spinhoven, P., Koeter, M., Wouters, L., Huyser, J. & Kamphuis, J. (2005) Preventing relapse/recurrence in recurrent depression with cognitive therapy: a randomized controlled trial. Journal of Consulting and Clinical Psychology 73, 647-57. http://dx.doi.org/10.1037/0022-006X.73.4.647