1. Barnard, C., and A. Menon. 2019. “Clean Brexit’ Sounds so Simple, Doesn’t It? Trouble Is, It Doesn’t Exist.” The Guardian, May 21. https://www.theguardian.com/commentisfree/2019/may/21/clean-brexit-party-no-deal
2. Brexit party. 2019. “Brexit Party’s Constitution.” Electoral Commission, March 12. https://www.electoralcommission.org.uk/__data/assets/pdf_file/0010/254791/FOI-030-19-Response.pdf
3. Curtice, J. 2015. “A Revolt on the Right? The Social and Political Attitudes of UKIP Supporters.” British Social Attitudes, 32, Natcen Social Research.
4. Curtice, J. 2019. “Fracture and Polarisation? Lessons from the Euro-election.” The UK in a Changing Europe, June 3. https://ukandeu.ac.uk/fracture-and-polarisation-lessons-from-the-euro-election/