Sachedina, Abdulaziz. "Natural Law and Knowledge of Ethical Necessity." Islam and the Challenge of Human Rights. : Oxford University Press, 2009-10-01. Oxford Scholarship Online. 2010-02-01. Date Accessed 22 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195388428.001.0001/acprof-9780195388428-chapter-3>.
Sachedina, A.(2009-10-01). Natural Law and Knowledge of Ethical Necessity. In Islam and the Challenge of Human Rights. : Oxford University Press. Retrieved 22 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195388428.001.0001/acprof-9780195388428-chapter-3.
Sachedina, Abdulaziz. "Natural Law and Knowledge of Ethical Necessity." In Islam and the Challenge of Human Rights. : Oxford University Press, 2009-10-01. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195388428.001.0001/acprof-9780195388428-chapter-3.
Sachedina A. Natural Law and Knowledge of Ethical Necessity. In: Sachedina A. Islam and the Challenge of Human Rights. Oxford University Press; 2009. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195388428.001.0001/acprof-9780195388428-chapter-3. Accessed May 22, 2013.