Owen, Lynette
Routledge, 1996
Buku Teks
Klose, Paul S., author
Dow Jones-Irwin, 1989
Buku Referensi
Hinrichs, Roger A., author
Thomson, Brooks/Cole, 2006
Buku Teks
Winkler, John W.
A Voon Book Division, 1972
Buku Teks
Heisoon, Shin, author
Uisul munhwasa, 2008
Buku Teks