Citations:

Abbreviations of Commonly Cited Sources

Below are a few examples of commonly cited sources that often incorporate abbreviations. Also consult our Abbreviations page for more information about abbreviations in APA and our Common Reference List Examples page for some examples of reference list entries.

First citation:

The Centers for Disease Control and Prevention (CDC, 2010)
 
(Centers for Disease Control and Prevention [CDC], 2010)

Subsequent citations:

The CDC (2010)
 
(CDC, 2010) 

In your reference list:

Centers for Disease Control and Prevention. (2010). Nutrition. https://www.cdc.gov/nutrition/

Centers for Disease Control and Prevention. (2011). The CDC guide to strategies to increase physical activity in the community. http://www.cdc.gov/obesity/downloads/PA_2011_WEB.pdf

In your sentences:

Narratively: No Child Left Behind (NCLB, 2002) on first reference; thereafter NCLB (2002).

Parenthetically: (No Child Left Behind [NCLB], 2002) on first reference; thereafter (NCLB, 2002).

In your reference list:

No Child Left Behind Act of 2001, Pub. L. No. 107-110, § 115, Stat. 1425 (2002).