Laski, Harold J.
The American democracy a commentary and interpretation
George Allen and Unwin, 1949
 Buku Teks SO
Williams, Robin W.
American society : a sociology interpretation
Alfred A. Knopf, 1963
 Buku Teks SO
William, Robin M.
American society : a sociological interpretation
Alfred, 1966
 Buku Teks
Williams, Robin M.
American society: a sociological interpretation
Alfred A. Knopf, 1966
 Buku Teks SO
Williams, Robin M.
American society : a sociological interpretation
Alfred A. Knopf, 1961
 Buku Teks SO