By Sophocles
By John Dewey
By Mary Frances Luce and others
By Bernard R. Berelson, Paul F. Lazarsfeld, William N. McPHEE
By T W Wann
By Arne Naess
By Ray E. Helfer and C. Henry Kempe
By W. J. T. Mitchell
By Melvin J. Friedman
By Harry Elmer Barnes