Richards, Duncan, Jeffrey Aronson, D. John Reynolds, and Jamie Coleman. Oxford Handbook of Practical Drug Therapy. New York, NY: Oxford University Press, 201111. Oxford Medicine. 201201. Date Accessed 22 May. 2013 <http://oxfordmedicine.com/view/10.1093/med/9780199562855.001.0001/med-9780199562855>.
Richards, D., Aronson, J., Reynolds, D., & Coleman, J.(201111). Oxford Handbook of Practical Drug Therapy. New York, NY: Oxford University Press. Retrieved 22 May. 2013, from http://oxfordmedicine.com/view/10.1093/med/9780199562855.001.0001/med-9780199562855.
Richards, Duncan, Jeffrey Aronson, D. John Reynolds, and Jamie Coleman. Oxford Handbook of Practical Drug Therapy. New York, NY: Oxford University Press, 201111. http://oxfordmedicine.com/view/10.1093/med/9780199562855.001.0001/med-9780199562855.
Richards D, Aronson J, Reynolds DJ, Coleman J. Oxford Handbook of Practical Drug Therapy. 2nd ed. New York, NY: Oxford University Press; 2011. http://oxfordmedicine.com/view/10.1093/med/9780199562855.001.0001/med-9780199562855. Accessed May 22, 2013.