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If you have a DOI:
Author(s). Article title. Journal Name. Year;vol(issue No.): inclusive pages. doi:10.00000000/000000000000
Towfighi A, Markovic D, Ovbiagele B. Utility of framingham coronary disease risk score for predicting cardiac risk after stroke. Stroke.2012;43(11):2942-2947. doi: 10.1161/STROKEAHA.112.668319. Accessed November 8, 2012.
Ng L, Karunasinghe N, Benjamin CS, Ferguson LR. Beyond PSA: are new prostate cancer biomarkers of potential value to New Zealand doctors? N Z Med J. 2012;125(1353). http://journal.nzma.org.nz/journal/125-1353/5146/. Accessed November 2, 2012.
Author(s). Book Title. Edition number (if is is the second edition or above). City, State (or Country) of publisher: Publisher's name; copyright year.
Riegelman RK, Kirkwood B. Public health 101: Healthy people--healthy populations. 2nd ed. Jones & Bartlett Learning; 2015.
Author(s). Book Title. Edition number (if is is the second edition or above). City, State (or Country) of publisher: Publisher's name; copyright year. URL. Accessed [date].
Field MJ, Boat TF, eds. Safe and Effective Medicines for Children: Pediatric Studies Conducted Under the Best Pharmaceuticals for Children Act and the Pediatric Research Equity Act. Washington, DC: Institute of Medicine of the National Academies; 2012. http://www.nap.edu/catalog.php?record_id=13311. Accessed January 28, 2013.
Author (or if no author is available, the name of the organization responsible for the site). Title (or, if not title is available, the name of the organization responsible for the site). Published date (if available). Updated date (if available). Name of the Web site. Url. Accessed [date].
Rainie L. The rise of the e-patient. Pew Research Center Internet and the American Life Project website. October 7, 2009. http://www.pewinternet.org/Presentations/2009/40-The-rise-of-the-e-patient.aspx Accessed January 11, 2012.
Air Pollution and Respiratory Health. Centers for Disease Control and Prevention website. Updated January 9, 2012. http://www.cdc.gov/Environmental/ Accessed March 2, 2012.