Howard‐Johnston, James. "George of Pisidia." Witnesses to a World Crisis: Historians and Histories of the Middle East in the Seventh Century. : Oxford University Press, 2010-06-10. Oxford Scholarship Online. 2010-09-01. Date Accessed 22 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199208593.001.0001/acprof-9780199208593-chapter-2>.
Howard‐Johnston, J.(2010-06-10). George of Pisidia. In Witnesses to a World Crisis: Historians and Histories of the Middle East in the Seventh Century. : Oxford University Press. Retrieved 22 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199208593.001.0001/acprof-9780199208593-chapter-2.
Howard‐Johnston, James. "George of Pisidia." In Witnesses to a World Crisis: Historians and Histories of the Middle East in the Seventh Century. : Oxford University Press, 2010-06-10. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199208593.001.0001/acprof-9780199208593-chapter-2.
Howard‐Johnston J. George of Pisidia. In: Howard-Johnston J. Witnesses to a World Crisis: Historians and Histories of the Middle East in the Seventh Century. Oxford University Press; 2010. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199208593.001.0001/acprof-9780199208593-chapter-2. Accessed May 22, 2013.