TY  - BOOK
AU  - Siebert, Fred S.
AU  - Peterson, Theodore.
AU  - Schramm, Wilbur.
TI  - Four theories of the press
SN  - 0252724216
U1  - 070.17 SIE 
PY  - 1956///
CY  - Chicago
PB  - University of Illionois Press
KW  - Press
KW  - Journalism
N1  - Includes bibliographical references P.147-153
ER  -