Heuston, R.F.V.
Sweet & Maxwell, 1977
Buku Teks
Clerk, J. F. (John Frederic)
Sweet and Maxwell, 2010
Buku Referensi
Levmore, Saul, author
Oxford University Press, 1994
Buku Teks
Prosser, William L., author
University of Michigan Law School, 1953
Buku Teks
Diamond, John L., author
Mattew Bender, 1996
Buku Teks