by William Ebenstein [and others]
Harper & Row, Publishers, 1970
Buku Teks
Millspaugh, Arthur Chester, |1883-1955
The Brookings Institution, 1942
Buku Teks
Rossiter, Clinton, 1917-1970, author
Alfred A. Knopf, 1956
Buku Teks
Tocqueville, Alexis De, author
David Campbell Publishers, 1994
Buku Referensi
Janda, Kenneth, author
Cengage Learning, 2012
Buku Teks