Winker, Margaret A. "Isotopes." AMA Manual of Style. 20090401. Oxford University Press. Date of access 18 May. 2013, <http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-167>.
Winker, M. (20090401). Isotopes. AMA Manual of Style. Retrieved 18 May. 2013, from http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-167.
Winker, Margaret A. "Isotopes." AMA Manual of Style. 18 May. 2013. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-167.
Winker MA. Isotopes. 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; 2007:707-710. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-167. Accessed May 18, 2013.