Waters, Donald, author
Addison-Wesley, 1998
Buku Teks
Jones, Martin Hartley, 1942-, author
Cambridge University Press, 1985
Buku Teks
Orna, Elizabeth, author
Gower, 1999
Buku Teks
Veryard, Richard, author
Prentice-Hall, 1992
Buku Teks
Henczel, Susan, author
Saur Verlag, 2001
Buku Teks