Mostaedi, Arian
Carlos Boto & Josep M ̊Minguet, 2002
Buku Teks
Rothwell, Roy.
Longman, 1985.
Buku Teks
Daniels, Klaus, author
Birkhäuse, 2000
Buku Teks
Jurewicz, Lynn, author
[American Library association, American Library association], 2003
eBooks
Hanan, Mack
Prentice-Hall, 1983
Buku Teks