Delbecq, Andre L.
Group techniques for program planning: a guide to nominal group and delphi proceeses
Green Briar Press, 1986
 Buku Teks
Fachmi Basyaib
Teori pembuatan keputusan
Grassindo (Gramedia Widiasarana Indonesia), 2006
 Buku Teks
Group techniques / Gerald Corey ...[et al.].
Brooks/Cole Publishing , 1982
 Buku Teks
Gulley, Halbert E.
Communication and group process: techniques for improving the quality of small-group communication
Holt, Rinehart and Winston, 1977
 Buku Teks
Corey, Gerald
Theory and practice of group counseling
Brooks/Cole, Cengage Learning, 2012
 Buku Teks