Odmark, John
Amsterdam John Benjamins 1980
Buku Teks
Washington : University of Washington
Majalah, Jurnal, Buletin
Donald Freeman and Jack C. Richardsand , author
Cambridge Cambridge University Press 1996
Buku Teks
Norwich : Edward Arnold, The educationl, academic and medical publishing
Majalah, Jurnal, Buletin
Edinburgh, Edinburgh University Press, 2005
Buku Referensi