Veiga, John F.
West Publ., 1979
Buku Teks
Galbraith, Jay R., author
Addison-Wesley , 1977
Buku Teks
Diana Wirawan, author
Fakultas Psikologi Universitas Indonesia, 2013
UI - Skripsi (Membership)
Kirk, James J., author
McGraww-Hill, 1997
Buku Teks
Heydebrand, Wolf V.
Prentice Hall Inc., 1973
Buku Teks