Young-Key, author
Routledge, 2009
Buku Teks
Byon, Andrew Sangpil, author
Routledge, Taylor & Francis Group, 2009
Buku Teks
Buku Teks
Yeon, Jaehoon, author
Routledge, 2011
Buku Teks
Martin, Samuel E.
Rutland Charles E. Tuttle Company 1992
Buku Referensi