Check out the Son of Citation machine... http://citationmachine.net/index2.php that allows users to put in their citation components and it generates the correct APA (or other) format.
For example, I went to the site, chose APA, filled in a few fields, and the "Son of Citation" machine provided the following citation:
Light, N. M. (2012, December 24). [Web log message]. Retrieved from http://www.blogger.com/blogger.g?blogID=5184637762230200062