Bernache, Carolyn
National Textbook Company , 1994
Buku Teks
Walter, Catherine
Cambridge University Press, 1992
Buku Teks
Arumdaun Hangukahokkyo, 2010
Buku Teks
Fry, Edward
The University Press, 1967
Buku Teks
Brewton
Laidlaw Brothers, 1958
Buku Teks