Horrie, Chris
Simon & Schuster , 1999
Buku Teks
Loven, Klarijn, author
KITLV Press, 2008
Buku Teks
Cashmore, Ellis, author
Routledge, 1994
Buku Teks
Terry, Patrick D., author
Addison-Wesley, 1986
Buku Teks
Alfonso, Anthony, author
Sophia University LL Center of Applied Linguistics, 1980
Buku Teks