Jo, Yeon Hyen
O Rae Deun Mi Rae, 2007
Buku Teks
Eun, Cheol S., author
McGraw-Hill, 2005
Buku Teks
Lee, Jong-taek, author
Chang Jak iwa BT pyeong Sa, 1997
Buku Teks
Jansson, Bruce S., author
Brooks/Cole; cengage learning, 2009
Buku Teks
by George M. Thomas [and others]
Sage, 1987
Buku Teks