Fontanarosa, Phil B., and Stacy Christiansen. "Length, Area, Volume, Mass." AMA Manual of Style. 20090401. Oxford University Press. Date of access 24 May. 2013, <http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div2-489>.
Fontanarosa, P., & Christiansen, S. (20090401). Length, Area, Volume, Mass. AMA Manual of Style. Retrieved 24 May. 2013, from http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div2-489.
Fontanarosa, Phil B., and Stacy Christiansen. "Length, Area, Volume, Mass." AMA Manual of Style. 24 May. 2013. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div2-489.
Fontanarosa PB, Christiansen S. Length, area, volume, mass. 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-div2-489. Accessed May 24, 2013.