Oppenheim, L., author
Longmans, Green, 1969
Buku Teks
Oppenheim, L., author
Longmas, Green , 1961
Buku Teks
Corbin, Arthur Linton, 1874-1967, author
West Publishing, 1950
Buku Teks
Slapper, Gary, author
Cavendish Publishing Limited, 2000
Buku Teks
Keenan, Denis, author
Pitman, 1992
Buku Teks