Rifki Feriandi
Peniti media, 2014
Buku Teks
Antoni Ludfi Arifin
Gramedia Pustaka Utama , 2012
Buku Teks
herausgegeben von Hartmut Günther, Otto Ludwig
Walter de Gruyter, 1994
Buku Referensi
Stramel, James S.
Pustaka Pelajar, 2002
Buku Teks
Jaspers, Joep
Academic Service, 2005
Buku Teks