Duckitt, John, and Chris G. Sibley. "A Dual Process Motivational Model of Ideological Attitudes and System Justification." Social and Psychological Bases of Ideology and System Justification. : Oxford University Press, 2009-08-01. Oxford Scholarship Online. 2009-05-01. Date Accessed 18 Jun. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195320916.001.0001/acprof-9780195320916-chapter-12>.
Duckitt, J., & Sibley, C.(2009-08-01). A Dual Process Motivational Model of Ideological Attitudes and System Justification. In Social and Psychological Bases of Ideology and System Justification. : Oxford University Press. Retrieved 18 Jun. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195320916.001.0001/acprof-9780195320916-chapter-12.
Duckitt, John, and Chris G. Sibley. "A Dual Process Motivational Model of Ideological Attitudes and System Justification." In Social and Psychological Bases of Ideology and System Justification. : Oxford University Press, 2009-08-01. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195320916.001.0001/acprof-9780195320916-chapter-12.
Duckitt J, Sibley CG. A Dual Process Motivational Model of Ideological Attitudes and System Justification. In: Jost JT, Kay AC, Thorisdottir H. Social and Psychological Bases of Ideology and System Justification. Oxford University Press; 2009. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195320916.001.0001/acprof-9780195320916-chapter-12. Accessed June 18, 2013.