Adams, Roy, author
University of Leiden, 1990
Buku Referensi
Tri Yaniarrinita, author
Universitas Indonesia, 2004
UI - Skripsi (Membership)
Harahap, Abdullah, author
Sinar Pelangi, [Date of publication not identified]
Buku Teks
Tobing, Nehemia, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2003
UI - Tesis (Membership)
Pahmi Sulaiman, author
1989
UI - Skripsi (Membership)