Q. How do I cite a Congressional Research Services report in APA?

Author, A. A. (Year). Title of report in sentence case and italics (CRS Report No. xxxxxxx). Retrieved from Congressional Research Service website: URL

Example: 

Erwin, M. C. (2011). Intelligence issues for Congress (CRS Report No. RL33539). Retrieved from Congressional Research Service website: http://www.fas.org/sgp/crs/intel/RL33539.pdf