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              Daraus wurde schließlich Elihu Katz / Paul F. Lazarsfeld, Personal Influence: The Part Played by People in the Flow of Mass Communications, New York 1955.
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              Katz, E., & Lazarsfeld, P. F. (1955). Personal influence. New York, NY: Free Press.
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              Katz, E./Lazarsfeld, P. F. (1955): Personal Injuence. The Part Played by People in the Flow of Muss Communications, GlencoeIIL: Free Press.
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              Katz, Elihu, and Paul F. Lazarsfeld. 1955. Personal Influence: The Part Played by People in the Flow of Mass Communications. Glencoe, IL.
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              Lazarsfeld, P., & Katz, E. (1955). Personal influence. Free Presse.
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