Gilliam, Ronald B.
Jones and Bartlett Publishers, 2011
Multimedia
Afia Fitriani
Fakultas Psikologi Universitas Indonesia, 2009
UI - Tesis (Open)
Andersen, Kenneth E.
Cummings Publishing, 1972
Buku Teks
Basic Books , 1963
Buku Teks
PSIKOM Univ Budi Luhur, 2015
Majalah, Jurnal, Buletin