Steinby, Torsten, author
Government, 1971
Buku Teks
Brown, James J., author
John Wiley & Sons, 1994
Buku Teks
Matthews, Paul, author
Sweet & Maxwell, 2000
Buku Teks
Bermann, George A., author
Thomson, 2003
Buku Teks
Pinsler, Jeffrey, author
LexisNexis , 2010
Buku Teks