McGregor, Bruce, and Harriet S. Meyer. "Controlled Vocabulary Indexing." 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-div1-137>.
McGregor, B., & Meyer, H. (20090401). Controlled Vocabulary Indexing. AMA Manual of Style. Retrieved 25 May. 2013, from http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-137.
McGregor, Bruce, and Harriet S. Meyer. "Controlled Vocabulary Indexing." AMA Manual of Style. 25 May. 2013. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-137.
McGregor B, Meyer HS. Controlled vocabulary indexing. 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-div1-137. Accessed May 25, 2013.