O'Hear, Natasha. "The Lambeth Apocalypse: Reading, Viewing, and ‘Internalizing’ the Book of Revelation in the Thirteenth Century." Contrasting Images of the Book of Revelation in Late Medieval and Early Modern Art: A Case Study in Visual Exegesis. : Oxford University Press, 2011-02-17. Oxford Scholarship Online. 2011-05-01. Date Accessed 22 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199590100.001.0001/acprof-9780199590100-chapter-2>.
O'Hear, N.(2011-02-17). The Lambeth Apocalypse: Reading, Viewing, and ‘Internalizing’ the Book of Revelation in the Thirteenth Century. In Contrasting Images of the Book of Revelation in Late Medieval and Early Modern Art: A Case Study in Visual Exegesis. : Oxford University Press. Retrieved 22 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199590100.001.0001/acprof-9780199590100-chapter-2.
O'Hear, Natasha. "The Lambeth Apocalypse: Reading, Viewing, and ‘Internalizing’ the Book of Revelation in the Thirteenth Century." In Contrasting Images of the Book of Revelation in Late Medieval and Early Modern Art: A Case Study in Visual Exegesis. : Oxford University Press, 2011-02-17. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199590100.001.0001/acprof-9780199590100-chapter-2.
O'Hear N. The Lambeth Apocalypse: Reading, Viewing, and ‘Internalizing’ the Book of Revelation in the Thirteenth Century. In: O'Hear NFH. Contrasting Images of the Book of Revelation in Late Medieval and Early Modern Art: A Case Study in Visual Exegesis. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199590100.001.0001/acprof-9780199590100-chapter-2. Accessed May 22, 2013.