Lip, Gregory Y.H., and D. Gareth Beevers. "Hypertensive urgencies and emergencies." Oxford Textbook of Medicine. New York, NY: Oxford University Press, 201005. Oxford Medicine. 201205. Date Accessed 24 May. 2013 <http://oxfordmedicine.com/view/10.1093/med/9780199204854.001.1/med-9780199204854-chapter-161705>.
Lip, G., & Beevers, D.(201005). Hypertensive urgencies and emergencies. In Oxford Textbook of Medicine. New York, NY: Oxford University Press. Retrieved 24 May. 2013, from http://oxfordmedicine.com/view/10.1093/med/9780199204854.001.1/med-9780199204854-chapter-161705.
Lip, Gregory Y.H., and D. Gareth Beevers. "Hypertensive urgencies and emergencies." In Oxford Textbook of Medicine. New York, NY: Oxford University Press, 201005. http://oxfordmedicine.com/view/10.1093/med/9780199204854.001.1/med-9780199204854-chapter-161705.
Lip GY, Beevers DG. Hypertensive urgencies and emergencies. In: Warrell DA, Cox TM, Firth JD, eds. Oxford Textbook of Medicine. 5th ed. New York, NY: Oxford University Press; 2010:3074-3082. http://oxfordmedicine.com/view/10.1093/med/9780199204854.001.1/med-9780199204854-chapter-161705. Accessed May 24, 2013.