Winker, Margaret A. "The Drug Development and Approval Process." AMA Manual of Style. 20090401. Oxford University Press. Date of access 21 May. 2013, <http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div2-399>.
Winker, M. (20090401). The Drug Development and Approval Process. AMA Manual of Style. Retrieved 21 May. 2013, from http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div2-399.
Winker, Margaret A. "The Drug Development and Approval Process." AMA Manual of Style. 21 May. 2013. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div2-399.
Winker MA. The drug development and approval process. 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-div2-399. Accessed May 21, 2013.