Public opinion polls.

Does mass communication change public opinion after all? Lemert, James B. 1981 Public information campaigns & opinion research edited by Hans-Dieter Klingemann and Andrea Röemmele 2002 Public opinion polls Safdar Mahmood 1990 Public opinion, polls, and democracy Crespi, Irving 1989 Sampling opinions Stephan, Frederick F. 1958 Surveys, polls, and samples: practical procedures Parten, Mildred Bernice 1966 The evolution of the British welfare State Fraser, Derek 1982