University of California Press, 1947
Buku Teks
Barber, Laurie
Century Hutchinson, 1989
Buku Teks
Todd, Stephen
Kluwer Law International, 2011
Buku Teks
Mulgan, Richard
Oxford University Press, 1989
Buku Teks
Sinclair, Keith
Penguin Books, 1986
Buku Teks