Geovanie, Jeffrie, author
Gramedia Pustaka Utama, 2013
Buku Teks
Wilsey, John D., author
IVP Academic, 2015
Buku Teks
edited by Hanneman Samuel and Henk Schulte Nordholt
Pustaka Pelajar, 2004
Buku Teks
Korean Overseas Information Service, 1978
Buku Teks
Helle Porsdam, editor
Edward Elgar, 2012
Buku Teks