Look near the top of the copyright page. The second printing of the hardcover and spiral-bound versions read "Second Printing, August 2009" and second printing of the paperback version reads "Second printing, October 2009."
The ISBN and publication date, July 2009, are the same on the first and second printing.
According to APA, they are only distributing the second printing now. If you buy from a bookstore you should check the copyright page. If you already own the first printing, you can get the corrections from the APA website.