Baron, Robert A.
Understanding human relations : a practical guide to people at work
Allyn and Bacon, 1991
 Buku Teks
The 1977 [one thousand nine hundred seventy-seven} annual handbook for group facilitators: the sixth annual / John. E. Jones and J. William Pfeiffer
John. E. Jones and J. William Pfeiffer
University Associates, 1977
 Buku Teks SO
The 1979 annual handbook for group facilitators: the eighth annual / John. E. Jones and J. William Pfeiffer
University Associates, 1979
 Buku Teks SO
Group techniques / Gerald Corey ...[et al.].
Brooks/Cole Publishing , 1982
 Buku Teks SO
West, Edie
The big book of icebreakers : 50 quick, fun activities for energizing meetings and workshops
McGraw-Hill, 1999
 Buku Teks