Wagne, Peter, author
Routledge, 1994
Buku Teks
Mill, John Stuart
E.P. Dutton and Company, 1955
Buku Teks
Mill, John Stuart
Yayasan Obor Indonesia, 1996
Buku Teks
Macmillan, 1995
Buku Teks
Thoreau, Henry David, 1817-1862, author
The Liberal Arts Press, 1945
Buku Teks