Annual reports are usually easy to find on a company's website. The APA Style Guide to Electronic References says to "format references to technical and research reports and other gray literature as you would a book retrieved online." Thus, a reference to an annual report follows the usual who-when-what-where format.
American Psychological Association. (2013). 2012 annual report of the American
Psychological Association. Retrieved from
If you used a print version of the report, replace the URL with the location and name of the publisher, like a reference to a book. And, note that when the author is the publisher, the word Author is used.
National Association of Social Workers. (2012). 2011–2012 annual report.
Washington, DC: Author.
In both cases, the in-text citation follows the author–date format (e.g., American Psychological Association, 2013; National Association of Social Workers, 2012).
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