Philip Davis, E. "The Economics of Social-Security Pensions." Pension Funds: Retirement-Income Security and Capital Markets: An International Perspective. : Oxford University Press, 1998-01-22. Oxford Scholarship Online. 2012-03-22. Date Accessed 21 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198293040.001.0001/acprof-9780198293040-chapter-3>.
Philip Davis, E.(1998-01-22). The Economics of Social-Security Pensions. In Pension Funds: Retirement-Income Security and Capital Markets: An International Perspective. : Oxford University Press. Retrieved 21 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198293040.001.0001/acprof-9780198293040-chapter-3.
Philip Davis, E. "The Economics of Social-Security Pensions." In Pension Funds: Retirement-Income Security and Capital Markets: An International Perspective. : Oxford University Press, 1998-01-22. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198293040.001.0001/acprof-9780198293040-chapter-3.
Philip Davis E. The Economics of Social-Security Pensions. In: Davis EP. Pension Funds: Retirement-Income Security and Capital Markets: An International Perspective. Oxford University Press; 1998. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198293040.001.0001/acprof-9780198293040-chapter-3. Accessed May 21, 2013.