Kaltenthaler E, Brazier J, De Negris E, Tumur I, Ferriter M, Beverley C, Parry G, Rooney G, Sutcliffe P. Computerised cognitive behaviour therapy for depression and anxiety update: a systematic review and economic evaluation. Health Technology Assessment 2006;10(33):1-186.
Kaltenthaler E, Parry G, Beverley C, Ferriter M. Computerised cognitive-behavioural therapy for depression: systematic review. British Journal of Psychiatry 2008;193(3):181-184.