Taylor, David A
Wiley, 1995
Buku Teks
Blackie Academic & Professional, 1995
Buku Teks
Donovan, John J., author
Prentice-Hall, 1994
Buku Teks
Waston, David
Falmer Press, 1998
Buku Teks
edited by Georg Heeg ... [and others]
Prentice-Hall, 1992
Buku Referensi