Field, Andy (2013) Discovering statistics using IBM SPSS statistics: (and sex and drugs and rock ‘n’ roll). 4th ed. Los Angeles: Sage.
Howell, David C. (2011) Fundamental statistics for the behavioral sciences. 7th ed. Belmont, CA: Wadsworth Cengage Learning.
J. Baron (2008) ‘Decisions about the future’, in Thinking and deciding. 4th ed. Cambridge: Cambridge University Press, 2008. Available at: https://contentstore.cla.co.uk/secure/link?id=89fa79eb-8243-e611-80bd-0cc47a6bddeb.