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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. Thinking and deciding [Internet]. 4th ed. Cambridge: Cambridge University Press, 2008; 2008. Available from: https://contentstore.cla.co.uk/secure/link?id=89fa79eb-8243-e611-80bd-0cc47a6bddeb