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Callan, MJ and Will Shead, N and Olson, JM (2015) 'The relation between personal relative deprivation and the urge to gamble among gamblers is moderated by problem gambling severity: A meta-analysis.' Addictive Behaviors, 45. 146 - 149. ISSN 0306-4603

Callan, MJ and Will Shead, N and Olson, JM (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). 246 - 249. ISSN 0022-1031

Callan, MJ and Ellard, JH and Will Shead, N and Hodgins, DC (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). 1514 - 1529. ISSN 0146-1672