Three other texts that have been recommended re CBT in groups are:

Bieling, P.J., McCabe, R.E., & Antony, M.M. (2006). Cognitive behavioral therapy in groups. New York: Guilford.



White, J. R. & Freeman, A. S. (2000). Cognitive-behavioral group therapy: For specific problems and populations. Washington, DC: American Psychological Association.



Rose, S. D. (1999). Group therapy: A cognitive-behavioral approach. In J. R. Price & D. R. Hescheles (Eds.) A guide to starting psychotherapy groups. San Diego, CA: Academic Press.


(I can't vouch for any of them myself)