O`Neill, William L., author
The progressive years : America comes of age
Harper & Row Publishers, 1975
 Buku Teks
Friedrich, Carl J., author
Constitutional government and democracy theory and practice in Europe and America
Blaisdell, 1949
 Buku Teks
American democracy : in world perspective
by William Ebenstein [and others]
Harper & Row, Publishers, 1970
 Buku Teks
Democracy by the people: reforming campaign finance in America
Cambridge University Press, 2018
 eBooks
Harding, Vincent, author
America will be! : conversations on hope, freedom, and democracy
Dialogue Path Press, 2013
 Buku Teks
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