Lopez, David, author
St. Paul Minn, 2000
Buku Teks
Bloomer, Aileen, 1947-, author
Routledge , 2006
Buku Teks
Hurford, James R.
Cambridge University Press, 1993
Buku Teks
Goatly, Andrew, author
Routledge , 2000
Buku Referensi
Grant, Jim
Routledge, 2008
Buku Teks