Q. How do I find a copy of the No Child Left Behind Act and cite it in APA style?

A copy of the public law can be found at the US Dept. of Education Website (found via google search "no child left behind" site:.gov)

The APA style citation would look like this:
Reference
No Child Left Behind Act of 2001, 20 U.S.C. § 6319 (2011).

In-Text Citation
No Child Left Behind Act (2011) or (No Child Left Behind Act, 2011)

If you have quotations from several provisions in the act, you may need to provide citations with the specific subheadings. You only need the subheadings if you have several references to the same statute.