Davies, Tony
Routledge, 1997
Buku Teks
Garry L. Hagberg and Walter Jost, editors
Wiley Balckwell, 2010
Buku Teks
Cambridge University Press, 1978
eBooks
Choi, In-ho, author
Yeobaek Media,
Buku Teks
Maman Lesmana, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2009
Buku Teks