Seong, Baek-Hyo, author
juntong, 1989
Buku Teks
Behrman, Carol H., author
Applied Research in Education, 2000
Buku Teks
Kim, Jun-seon, author
Hakmun, 2006
Buku Teks
Wray, David
Routledge, 1991
Buku Teks
Kim, Chung Sop, author
Kyung Hee University Press, 2005
Buku Teks