Encyclopedias and reference sources provide background information and can be used to identify key people, events and dates which can then be used as search terms for finding additional information. In addition most encyclopedia articles include short bibliographies that will lead you to related readings.
Find answers to your research methods questions. Search for the name of a method or use the Methods Map.
The Encyclopedia of Survey Research Methods has an entry for Public Opinions that covers these areas:
"Public Opinion." Encyclopedia of Survey Research Methods, edited by Paul J. Lavrakas, vol. 2, SAGE Publications, 2008, pp. 635-640. Gale Virtual Reference Library, http://link.galegroup.com.offcampus.lib.washington.edu/apps/doc/CX3073300430/GVRL?u=wash_main&sid=GVRL&xid=341ccf8f. Accessed 24 Oct. 2018.