Bradgate, Robert, author
Butterworth, 1991
Buku Teks
White, James J., author
St. Paul, Minn, 1995
Buku Teks
Simpson, Laurence P., author
Alexander Hamilton Institute, 1961
Buku Teks
Adams, Kristen David, author
St. Paul, MN : West Group, 2010
Buku Teks
Macintryre, Ewan, author
Blackstone Press, 1998
Buku Referensi