1. Sturgis, P. et al. Report of the Inquiry into the 2015 British General Election Opinion Polls (Market Research Society and British Polling Council, 2016).
2. An Evaluation of 2016 Election Polls in the US (AAPOR, 2017);
http://www.aapor.org/Education-Resources/Reports/An-Evaluation-of-2016-Election-Polls-in-the-U-S.aspx
3. Silver, N. The world may have a polling problem. FiveThirtyEight
http://fivethirtyeight.com/live-blog/uk-general-election-2015/
(2015).
4. Williams, J. P. The problem with polls. U.S. News and World Report (28 September 2015);
https://www.usnews.com/news/the-report/articles/2015/09/28/why-public-opinion-polls-are-increasingly-inaccurate
5. Zukin, C. What’s the matter With polling? The New York Times (21 June 2015);
https://www.nytimes.com/2015/06/21/opinion/sunday/whats-the-matter-with-polling.html?_r=0