https://en.wikipedia.org/wiki/Two-step_flow_of_communication
Paul Lazarsfeld and Elihu Katz are considered to be the founders of functional theory and their book Personal Influence (1955) is considered to be the handbook to the theory.
https://en.wikipedia.org/wiki/Two-step_flow_of_communication
Paul Lazarsfeld and Elihu Katz are considered to be the founders of functional theory and their book Personal Influence (1955) is considered to be the handbook to the theory.