Lurie, Stephen J., and Margaret A. Winker. "Spelling Out Numbers." AMA Manual of Style. 20090401. Oxford University Press. Date of access 20 May. 2013, <http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-197>.
Lurie, S., & Winker, M. (20090401). Spelling Out Numbers. AMA Manual of Style. Retrieved 20 May. 2013, from http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-197.
Lurie, Stephen J., and Margaret A. Winker. "Spelling Out Numbers." AMA Manual of Style. 20 May. 2013. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-197.
Lurie SJ, Winker MA. Spelling out numbers. In: AMA Manual of Style Committee. AMA Manual of Style: A Guide for Authors and Editors. 10th edition ed. New York, NY: Oxford University Press; 2007:823-826. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-197. Accessed May 20, 2013.