Universitas Merdeka Malang, 1991
Buku Referensi
Manggala, Bems, author
Program Pascasarjana Universitas Indonesia, 2001
UI - Tesis (Membership)
Silalahi, P. Remedy, author
Program Pascasarjana Universitas Indonesia, 2003
UI - Tesis (Membership)
Mardety, author
1995
UI - Tesis (Membership)
Soroy Lardo, author
University of Indonesia, Faculty of Humanities, 2020
Artikel Jurnal