Sabaria Umahuk, author
Fakultas Psikologi Universitas Indonesia, 2006
UI - Tesis (Membership)
Willy Ekariyono, author
Program Pascasarjana Universitas Indonesia, 2003
UI - Tesis (Membership)
Yayasan Bhakti Wawasan Nusantara, 1992
Buku Referensi
R. Sakhnan, author
Universitas Indonesia, 2001
UI - Tesis (Membership)
Riani Triesnawati, author
Universitas Indonesia, 2000
UI - Tesis (Membership)