Walton, Richard E., author
Addison-Wesley, 1969
Buku Teks
Noviyanti, author
2003
UI - Skripsi (Membership)
Johnson, David W., 1940-, author
Prentice Hall Internasional, 1990
Buku Teks
Fuad Hassan, author
Bhratara, 1974
Buku Teks
Sismai Herni, author
Fakultas Psikologi Universitas Indonesia, 2000
UI - Tesis (Membership)