Ballard, Ernest
Cambridge University Press, 2014
Buku Teks
Rimanang, Anton
Kepel Press, 2016
Buku Teks
Shaffer, David F.
Hollym, 2007
Buku Referensi
Kim, Myong-ja
Minsogwon , 2007
Buku Teks
Hutapea, Poppy Marlina Monica
2015
UI - Skripsi (Membership)