University of Surrey, 2004
Buku Teks
Han, Suzanne Crowder, author
Seoul : Hollym, 2007
Buku Teks
Edited by Peter H.Lee
Cambridge University Press , 2006
Buku Teks
Korean Overseas Information Service
Hollym, 2003
Buku Teks
Vincent, Mark, author
London University, 2003
Buku Teks