2Rosenblum, Nancy L. Introduction [ C ]//Rosenblum, Nancy L. Thoreau: Political Writings. New York: Cambridge University Press, 1996.
3Meltzer, Milton. Thoreau: People, Principles, and Politics [M]. New York: Hill and Wang, 1963:xi.
4Gougeon, Len. Thoreau and Reform [C]//Meyerson, Joer. The Cambridge Companion to Henry David Thoreau.上海:上海外语教育出版社,2000.194-214.
5Thoreau, Henry David. Thoreau- Political Writings [ C ]// Rosenblum, Nancy L. Thoreau : Political Writings. New York: Cambridge University Press, 1996.
6Wolf, William J. Thoreau: Mystic, Prophet, Ecologist [ M ]. Philadelphia: Pilgrim Press, 1974:82.
7Parrington, Vernon Louis. Main Currents in American Thought [ M ]. New York : Harcourt, Brace and Company, 1930.
8Matthiessen, Francis Otto. American Renaissance: Art and Expression in the age of Emerson and Whitman [ M ]. London : Oxford University Press, 1946.