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American Psychological Association (APA) Citation Style
American Psychological Association Citation Style

APA citation style for Websites:

National Cancer Institute. Underlying mortality data provided by National Center for Health Statistics.(n.d).Retrieved September 20, 2005, from http://www.cdc.gov/nchs/.

(Note: use n.d. when a publication date is not available)

If you have any questions, please feel free to contact a reference librarian or to consult the print version of the Publication Manual of the American Psychological Association.