1. Kuhn, T.S.: The Structure of Scientific Revolutions. University of Chicago press, Chicago (2012)
2. Katz, E.: Communications research since lazarsfeld. Public Opin. Q. 51, S25–S45 (1987)
3. Lazarsfeld, P.F., Berelson, B., Gaudet, H.: The people’s choice (1944)
4. Ames, B.: The Deadlock of Democracy in Brazil. University of Michigan Press, Ann Arbor (2002)
5. Calabre, L.: The role of radio in everyday Brazilian society (1923–1960). In: Portuguese Literary and Cultural Studies, pp. 617–623 (2000)