Artikel Jurnal
edited by Heinz Katschnig, Hugh Freeman and Norman Sartorius
John Wiley & Sons, 2006
Buku Teks
Lauer, Robert H., author
McGraw-Hill, 2014
Buku Teks
Aviantara Agung Nugraha, author
Fakultas Psikologi Universitas Indonesia, 2009
UI - Skripsi (Open)
Nurhayati Fajar M. Nofitri, author
Universitas Indonesia, 2009
UI - Skripsi (Open)