Katz, Milton
The Foundation Press, 1960
Buku Teks
Harris, D.J.
Sweet & Maxwell, 1983
Buku Teks
Harris, D. J.
Sweet & Maxwell, 1991
Buku Teks
Dixon, Martin
Black Stone Press Limited, 1998
Buku Teks
Steiner, Henry J., author
The Foundation Press, 1968
Buku Teks