Warner, W. Lloyd, author
Science Research Associates, 1949
Buku Teks
Tocqueville, Alexis De, author
Oxford University Press, 1961
Buku Teks
Tocqueville, Alexis De, author
The New American Library, 1963
Buku Teks
Wilder
Gramedia, 1956
Buku Teks
Harlow, Ralph Volney, author
Holt, Rinehart and Winston,Inc, 1964
Buku Teks