Christiansen, Stacy. "Modifiers." AMA Manual of Style. 20090401. Oxford University Press. Date of access 20 Jun. 2013, <http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-80>.
Christiansen, S. (20090401). Modifiers. AMA Manual of Style. Retrieved 20 Jun. 2013, from http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-80.
Christiansen, Stacy. "Modifiers." AMA Manual of Style. 20 Jun. 2013. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-80.
Christiansen S. Modifiers. In: AMA Manual of Style: A Guide for Authors and Editors. New York, NY: Oxford University Press; 2007. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-80. Accessed June 20, 2013.