To cite software, use the following form:
Epi Info. Version 7.1.5. Centers for Disease Control and Prevention; 2015. Accessed March 14, 2016. http://www.cdc.gov/epiinfo
Stata 14. Version 14. StataCorp; 2015. Accessed March 14, 2016. http://www.stata.com/
Software need not always be cited in the reference list; for example, it may be cited in the text if it is mentioned in the Statistical Analysis subsection of the Methods section. The following is an example of an in-text citation for software:...