Lauer, Robert H., author
McGraw-Hill, 2012
Buku Teks
Rif`atul Mahmudah, author
Fakultas Psikologi Universitas Indonesia, 2012
UI - Skripsi (Open)
Miranty, author
Fakultas Psikologi Universitas Indonesia, 2008
UI - Skripsi (Open)
Koupelis, Theo, author
Jones & Bartlett learning, 2011
Buku Teks
Steinby, Torsten, author
Government, 1971
Buku Teks