Hersey, George L., author
MIT Press, 1983
Buku Teks
Istana Kepresidenan, 1978
Buku Referensi
Florida, Nancy K., author
Southeast Asia Program, 2000
Buku Teks
Lumban Tobing, Lolita Refani, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2012
UI - Skripsi (Open)
Neath, Ian, author
Belmont, 2003
Buku Teks