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Callan, Mitchell J and Will Shead, N and Olson, James M (2009) 'Foregoing the labor for the fruits: The effect of just world threat on the desire for immediate monetary rewards.' Journal of Experimental Social Psychology, 45 (1). pp. 246-249. ISSN 0022-1031

Callan, Mitchell J and Ellard, John H and Will Shead, N and Hodgins, David C (2008) 'Gambling as a Search for Justice: Examining the Role of Personal Relative Deprivation in Gambling Urges and Gambling Behavior.' Personality and Social Psychology Bulletin, 34 (11). pp. 1514-1529. ISSN 0146-1672