1. Harry S. Broudy ,The Real World of the Public Schools( New York : Harcourt, Brace, Jovanovich , 1972 ), p. 41 .
2. Howard K. Beale ,Are American Teachers Free?( New York : Charles Scribner's Sons , 1936 ), p. 775 .
3. Charles Silberman ,Crisis in the Classroom( New York : Random House , 1970 ), p. 10 .
4. Charles Silberman ,Crisis, pp. 10 – 11 .