Bowler, Shaun, Elisabeth Carter, and David M. Farrell. "Changing Party Access to Elections." Democracy Transformed?: Expanding Political Opportunities in Advanced Industrial Democracies. : Oxford University Press, 2003-12-18. Oxford Scholarship Online. 2006-02-01. Date Accessed 24 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/0199264996.001.0001/acprof-9780199264995-chapter-5>.
Bowler, S., Carter, E., & Farrell, D.(2003-12-18). Changing Party Access to Elections. In Democracy Transformed?: Expanding Political Opportunities in Advanced Industrial Democracies. : Oxford University Press. Retrieved 24 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/0199264996.001.0001/acprof-9780199264995-chapter-5.
Bowler, Shaun, Elisabeth Carter, and David M. Farrell. "Changing Party Access to Elections." In Democracy Transformed?: Expanding Political Opportunities in Advanced Industrial Democracies. : Oxford University Press, 2003-12-18. http://www.oxfordscholarship.com/view/10.1093/0199264996.001.0001/acprof-9780199264995-chapter-5.
Bowler S, Carter E, Farrell DM. Changing Party Access to Elections. In: Cain BE, Dalton RJ, Scarrow SE. Democracy Transformed?: Expanding Political Opportunities in Advanced Industrial Democracies. Oxford University Press; 2003. http://www.oxfordscholarship.com/view/10.1093/0199264996.001.0001/acprof-9780199264995-chapter-5. Accessed May 24, 2013.