Lurie, Stephen J., and Margaret A. Winker. "Measures of Time." AMA Manual of Style. 20090401. Oxford University Press. Date of access 25 May. 2013, <http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div2-503>.
Lurie, S., & Winker, M. (20090401). Measures of Time. AMA Manual of Style. Retrieved 25 May. 2013, from http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div2-503.
Lurie, Stephen J., and Margaret A. Winker. "Measures of Time." AMA Manual of Style. 25 May. 2013. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div2-503.
Lurie SJ, Winker MA. Measures of time. In: AMA Manual of Style Committee. AMA Manual of Style: A Guide for Authors and Editors. 10th ed. New York, NY: Oxford University Press; 2007. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div2-503. Accessed May 25, 2013.