Boix, Carles, author
Cambridge University Press, 2003
Buku Teks
Padover, Saul K. (Saul Kussiel), author
Praeger, 1967
Buku Teks
Nagle, John D.
Sage Publications, 1999
Buku Teks
Tocqueville, Alexis De, author
The Bantam Classic, 2000
Buku Teks
Mackie, Gerry, author
Cambridge University Press, 2003
Buku Teks