Tian P. Oei
A group cognitive behavioral therapy program for anxiety / Tian P. S. Oei
Tooworg Private Hospital, 1999
 Buku Teks
Cognitive behaviour therapy with older people
by Ken Laidlaw ... [and others]; foreword, Aaron T. Beck
John Wiley & Sons, 2003
 Buku Teks SO
Kaplan, Harold I.
Comprehensive group psychotherapy
Williams & Wilklins , 1993
 Buku Teks
Levine, Baruch
Group psychotherapy / Baruch Levine
Prentince Hall, 1979
 Buku Teks
Berne, Eric
Principles of group treatment / Eric Berne
Oxford University Press, 1969
 Buku Teks