Discovery Media, 2008
Buku Referensi
Yoo, Myeong-jong
Discovery Media, [date of publication not identified]
Buku Teks
Indonesia. Departemen Pendidikan dan Kebudayaan
Ministry of Education and Culture, Republic of Indonesia, 2012
Buku Teks
Joe, Wanne J.
Chung Ang University Press, 1981
Buku Teks
Lee, Seung Hun
Phuren Ssasang, 2009
Buku Referensi