Galbraith, Jay R.
Addison-Wesley , 1977
Buku Teks
Diana Wirawan
Fakultas Psikologi Universitas Indonesia, 2013
UI - Skripsi (Membership)
Kirk, James J.
McGraww-Hill, 1997
Buku Teks
Wolf, Thomas
Prentice-Hall, 1990
Buku Teks
Heydebrand, Wolf V., editor
Prentice Hall Inc., 1973
Buku Teks