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