Beattie, John
Free Press of Glencoe, 1966
Buku Teks
Beattie, John
The Free Press, 1964
Buku Teks
Mill, J.S.
Penguin Books, 1987
Buku Teks
Santayana, George
Columbia University Press, 1995
Buku Teks
Camus, Albert, 1913-1960
Vintage Books, 1955
Buku Teks