Personal influence : the part played by people in the flow of mass communications - Katz, Elihu 1926-2021; Lazarsfeld, Paul Felix 1901-1976; Roper, Elmo 1900-1971 (New York The Free Press of Glencoe, 1964)
En port.: "a report of the Bureau of Applied Social Research, Columbia University"
Keywords: Medios de comunicación social -- -Sociología