edited by Adam Hardy and Necdet Teymur
Tuestion Press, 1996
Buku Teks
Phoenix Publishing Limited, 2011
Buku Referensi
edited by Malcolm McCullough, William J. Mitchell, and Patrick Purcell
MIT Press, 1990
Buku Teks
Mills, Criss B., author
Wiley-Academy, 2011
Buku Teks
Conway, Hazel, author
Routledge , 1994
Buku Teks