OKell, Eleanor Regina. "Inheritance and the Athenian nature of Sophoclean tragedy." Why Athens?: A Reappraisal of Tragic Politics. : Oxford University Press, 2011-04-07. Oxford Scholarship Online. 2011-05-01. Date Accessed 19 Jun. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199562329.001.0001/acprof-9780199562329-chapter-11>.
OKell, E.(2011-04-07). Inheritance and the Athenian nature of Sophoclean tragedy. In Why Athens?: A Reappraisal of Tragic Politics. : Oxford University Press. Retrieved 19 Jun. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199562329.001.0001/acprof-9780199562329-chapter-11.
OKell, Eleanor Regina. "Inheritance and the Athenian nature of Sophoclean tragedy." In Why Athens?: A Reappraisal of Tragic Politics. : Oxford University Press, 2011-04-07. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199562329.001.0001/acprof-9780199562329-chapter-11.
OKell ER. Inheritance and the Athenian nature of Sophoclean tragedy. In: Carter DM. Why Athens?: A Reappraisal of Tragic Politics. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199562329.001.0001/acprof-9780199562329-chapter-11. Accessed June 19, 2013.