Coad, Jane, author
Churchill Livingstone Elsevier, 2011
Buku Teks
Coad, Jane, author
Elsevier , 2005
Buku Teks
Patton, Kevin T., author
Elsevier Mosby, 2013
Buku Teks
Jackson, Sheila M.
The English Language Book, 1979
Buku Teks
Tortora, Gerard J., author
Purdue University, 1998
Buku Teks