Rajagukguk, Omas Bulan, author
Souhampion University, 1991
Artikel Jurnal
Encyclopaedia Britannica Inc., 1987
Buku Referensi
Departemen Informasi Republik Indonesia, 1987
Buku Referensi
editor David K. Wyatt, Anna Leon Shulman, Vimla Sharma
Association for Asian Studies, 1994
Buku Referensi
edited, Lester R. Brown, Goris Ginggut
Yayasan Obor Indonesia, 1987
Buku Teks