Artikel Jurnal
Michels, Robert, 1876-1936, author
Collier Books, 1962
Buku Teks
Tocqueville, Alexis De, author
Oxford University Press, 1961
Buku Teks
Tocqueville, Alexis De, author
The New American Library, 1963
Buku Teks
Tocqueville, Alexis De, author
Vintage Books, 1956
Buku Teks