Joad, Raymond. "Introduction: Protestant Angels, Poets, the Imagination." Milton's Angels: The Early-Modern Imagination. : Oxford University Press, 2010-02-25. Oxford Scholarship Online. 2011-10-03. Date Accessed 18 Jun. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199560509.001.0001/acprof-9780199560509-chapter-1>.
Joad, R.(2010-02-25). Introduction: Protestant Angels, Poets, the Imagination. In Milton's Angels: The Early-Modern Imagination. : Oxford University Press. Retrieved 18 Jun. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199560509.001.0001/acprof-9780199560509-chapter-1.
Joad, Raymond. "Introduction: Protestant Angels, Poets, the Imagination." 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-1.
Joad R. Introduction: Protestant Angels, Poets, the Imagination. 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-1. Accessed June 18, 2013.