Joad, Raymond. "Angelology: Knowledge of Angels." Milton's Angels: The Early-Modern Imagination. : Oxford University Press, 2010-02-25. Oxford Scholarship Online. 2011-10-03. Date Accessed 19 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199560509.001.0001/acprof-9780199560509-chapter-3>.
Joad, R.(2010-02-25). Angelology: Knowledge of Angels. In Milton's Angels: The Early-Modern Imagination. : Oxford University Press. Retrieved 19 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199560509.001.0001/acprof-9780199560509-chapter-3.
Joad, Raymond. "Angelology: Knowledge of Angels." In Milton's Angels: The Early-Modern Imagination. : Oxford University Press, 2010-02-25. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199560509.001.0001/acprof-9780199560509-chapter-3.
Joad R. Angelology: Knowledge of Angels. In: Raymond J. Milton's Angels: The Early-Modern Imagination. Oxford University Press; 2010. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199560509.001.0001/acprof-9780199560509-chapter-3. Accessed May 19, 2013.