Croce, Benedetto
George Allen and Unwin, 1949
Buku Teks
Croce, Benedetto
Meridian, 1955
Buku Teks
Cohen, Morris R.
Open Court, 1961
Buku Teks
Seligman, Edwin R.A., author
Columbia University Press, 1949
Buku Teks
Niebuhr, Reinhold, author
Nisbet, 1947
Buku Teks