Halomoan, Cristof Naek, author
Fakultas Teknik Universitas Indonesia, 2008
UI - Skripsi (Open)
Mitolo, Massimo A.G., author
McGraw-Hill, 2009
Buku Teks
Jakarta : KITLV (Royal Netherlands Institute of Southeast Asia and Caribbean Studies)
Majalah, Jurnal, Buletin
Fallows, James
Pantheon Books, 1994
Buku Teks
Jennings, M. Kent, author
Collier-Macmillan , 1964
Buku Teks