TY  - BOOK
AU  - Siebert, Fred Seaton
AU  - Peterson, Theodore
AU  - Schramm, Wilbur
TI  - Four theories of the press: : the authoritarian, libertarian, social responsability and soviet comunist concepts of what the press should be and do
PY  - 1956///
CY  - Illinois, Estados Unidos
PB  - University of Illinois Press
KW  - Prensa
KW  - Periodismo
KW  - Comunicación
ER  -