Newton, James, Nikant Sabharwal, Saul G. Myerson, Stephen Westaby, and Bernard Prendergast. OSH Valvular Heart Disease. New York, NY: Oxford University Press, 2011-02-03. Oxford Medicine. 201110. Date Accessed 22 May. 2013 <http://oxfordmedicine.com/view/10.1093/med/9780199559237.001.0001/med-9780199559237>.
Newton, J., Sabharwal, N., Myerson, S., Westaby, S., & Prendergast, B.(2011-02-03). OSH Valvular Heart Disease. New York, NY: Oxford University Press. Retrieved 22 May. 2013, from http://oxfordmedicine.com/view/10.1093/med/9780199559237.001.0001/med-9780199559237.
Newton, James, Nikant Sabharwal, Saul G. Myerson, Stephen Westaby, and Bernard Prendergast. OSH Valvular Heart Disease. New York, NY: Oxford University Press, 2011-02-03. http://oxfordmedicine.com/view/10.1093/med/9780199559237.001.0001/med-9780199559237.
Newton J, Sabharwal N, Myerson SG, Westaby S, Prendergast B. OSH Valvular Heart Disease. New York, NY: Oxford University Press; 2011. http://oxfordmedicine.com/view/10.1093/med/9780199559237.001.0001/med-9780199559237. Accessed May 22, 2013.