Chung, Hyung-Min, author
Hollym, 2006
Buku Teks
Wilkes, Angela
Chicago: A Division of NTC Pub., 1987,
Buku Referensi
Blackstone, Judith, author
Writers and Readers, 1986
Buku Teks
Hill, G.A., author
Ginn, 1889
Buku Teks
Worth, Thomas, author
Prentice-Hall of India 1981, 1977
Buku Teks