Mill, J.S.
Penguin Books, 1987
Buku Teks
Santayana, George, author
Columbia University Press, 1995
Buku Teks
Camus, Albert, 1913-1960, author
Vintage Books, 1955
Buku Teks
Costa, Horacio La de
Solidaridad Publishing House, 1965
Buku Teks
Whitehead, Alfred North, 1861-1947, author
The Free Press , 1968
Buku Teks