The APA Style Blog (http://blog.apastyle.org) provides helpful advice on citing information found on a website. See the blog post How to Cite Something You Found on a Website in APA Style (http://blog.apastyle.org/apastyle/2010/11/how-to-cite-something-you-found-on-a-website-in-apa-style.html).
For a description of a running head, see the last paragraph of p. 229 in the Publication Manual of the American Psychological Association (hereafter Publication Manual), 6th edition. Additionally, note the sample papers on p. 41. The Publication Manual is available for your use at the Reference Desk.
If the DOI is not present in the database record or in the article, typically on the first page, search Free DOI Lookup (CrossRef).
See also What is a digital object identifier, or DOI? (American Psychological Association).
(Permanent link to "How do I find a document's DOI (digital object identifier)?")
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