Gale, Maggie Barbara
Routledge, 1996
Buku Teks
Griffin, Gabriele, author
Cambridge University Press, 2003
Buku Teks
Jodie Medd, author
Cambridge University Press, 2012
eBooks
Couto, Maria, author
St. Martin's Press, 1988
Buku Teks
Cambridge University Press , 1996
Buku Teks