Reference list entry
In the face of extinction. (2008, May). NSF Current. Retrieved from http://www.nsf.gov/news/newsletter/may_08/index.jsp
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Explain
Cite as an online article, giving the title of the newsletter and whatever other information is available, including volume and issue numbers.
Note on breaking URLs and DOIs
If you must break a URL or a DOI at the end of a line, break it after a double slash or before any other mark of punctuation.
Do not add a hyphen.
Do not put a period at the end of the entry.
Directory to APA reference list models
Exercise: APA documentation: identifying elements of sources
Exercise: APA documentation: reference list 1
Exercise: APA documentation: reference list 2
Exercise: APA documentation: reference list 3
Exercise: APA documentation