Eva Hjorne
Sense, 2012
eBooks
Gredler, Margaret E., author
The Guilford Press, 2008
Buku Teks
Abu Ahmadi, author
Rineka Cipta , 1991
Buku Teks
Napitupulu, Hotma Ria, author
Fakultas Psikologi Universitas Indonesia, 1993
UI - Skripsi (Membership)
Burke, Kay, author
Hawker Brownlow Education, 1999
Buku Teks