People's Publshing House, [date of publication not identified]
Buku Teks
Greenberg, Cathy L.
Salemba Humanika, 2011
Buku Teks
Markey, Ray
New South Wales University Press, 1988
Buku Teks
Longman , 1999
Buku Teks
Choi, Jun-sik
Sasyejeol Chulphana, 2010
Buku Teks