Cook, Mark, author
Wiley-Blackwell, 2009
Buku Teks
Saragih, Rosdiana Safyanti, author
Fakultas Psikologi Universitas Indonesia, 2006
UI - Tesis (Membership)
Diah Irmasari, author
Universitas Indonesia, 2006
UI - Tesis (Membership)
Gatewood, Robert D.
The Dryden Press, 1990
Buku Teks
Yunita Astridiyaningwati, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2007
UI - Tesis (Membership)