Easton, Stewart C., author
Holt, Rinehart and Winston, 1966
Buku Teks
National Council for Civil Liberties with Pluto Press, 1994
Buku Teks
Dahrendorf, Ralf, author
Stanford University Press, 1975
Buku Teks
Santayana, George, author
Scribner, 1951
Buku Teks
Otterspeer, Willem, author
Leiden University Press, 2008
Buku Teks