Click on the following links. Please note these will open in a new window.
Beck, A. T. (2008). The evolution of the cognitive model of depression and its neurobiological correlates. American Journal of Psychiatry, 165(8): 969–977. (An excellent overview of the cognitive model of depression from the guru of this topic, with some accessible explanations of how the theory relates to brain dysfunction in mood disorders.)
Garratt, G., Ingram, R. E., Rand, K. L., & Sawalani, G. (2007). Cognitive processes in cognitive therapy: Evaluation of the mechanisms of change in the treatment of depression. Clinical Psychology: Science and Practice, 14(3): 224–239. (Engaging discussion on the role of cognitive change in the mechanism of the action of different treatments for major depression, with a focus on CBT.)
Scher, C. D., Ingram, R. E., & Segal, Z. V. (2005). Cognitive reactivity and vulnerability: Empirical evaluation of construct activation and construct diatheses in unipolar depression. Clinical Psychology Review, 25(4): 487–510. (Very readable dissection of the evidence on the causal influence of depressogenic cognitions on depressed mood.)