1. Allison, P.: Multiple Regression: A Primer. Pine Forge Press, Thousand Oaks (1999)
2. Allison, P.: When can you safely ignore multicollinearity? Statistical Horizons Blog, 10 September.
http://statisticalhorizons.com/multicollinearity
(2012). Accessed 6 Sept 2017
3. Baguley, T.: Multicollinearity and collinearity in (in multiple regression)—a tutorial. Psychological Statistics Blog 9 November.
http://psychologicalstatistics.blogspot.co.uk/2013/11/multicollinearity-and-collinearity-in.html#!/
(2013). Accessed 6 Sept 2017
4. Baron, R.M., Kenny, D.A.: The moderator–mediator variable distinction in social psychological research: conceptual, strategic, and statistical considerations. J Personal. Soc. Psychol. 51(6), 1173–1182 (1986)
5. Clarke, H.D., Sanders, D., Stewart, M.C., Whiteley, P.: Performance Politics and the British Voter. Cambridge University Press, Cambridge (2010)