Cambridge University Press, 2007
eBooks
Chametzky, Robert A.
Blackwell, 2000
Buku Teks
Gert Webelhuth edited by
Blackwell, 1995
Buku Teks
Giorgi, Alessandra
Cambridge University Press , 1991
Buku Teks
Dignen, Bob, author
York Associates, 1999
Buku Teks