Gregoline, Brenda. "How Plurals Are Formed." AMA Manual of Style. 20090401. Oxford University Press. Date of access 19 May. 2013, <http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-99>.
Gregoline, B. (20090401). How Plurals Are Formed. AMA Manual of Style. Retrieved 19 May. 2013, from http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-99.
Gregoline, Brenda. "How Plurals Are Formed." AMA Manual of Style. 19 May. 2013. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-99.
Gregoline B. How plurals are formed. 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; 2007:367. http://www.amamanualofstyle.com/view/10.1093/jama/9780195176339.001.0001/med-9780195176339-div1-99. Accessed May 19, 2013.