List the name of the act you're citing in the APA-style paper. In this case, it would be No Child Left Behind Act of 2001.
Add a comma after the act title, then indicate the volume source where NCLB statute is published. This is the set of books where the federal government lists the actual act and its description. NCLB act was published in volume 20 of the United States Code. In APA-style, it is correct to use the acronym U.S.C. instead of spelling out the title.
Add a "§" symbol then list the section number for the part of the act of NCLB you're referencing.
Indicate the year the information was updated in parenthesis. End your citation with a period. According to Valdosta State University, a correct citation of NCLB looks like this: No Child Left Behind Act of 2001, 20 U.S.C. § 6319 (2008).