Moore, Harry T., author
Heinemann, 1976
Buku Teks
Namho, Lee, author
EastBridge, 2005
Buku Teks
Namho, Lee, author
East Bridge, 2005
Buku Teks
Ward, A.C.
The English Language Book, 1928
Buku Teks
Kamm, Antony, author
Harper Collins Pub., 1993
Buku Referensi