1. Agency for Healthcare Research and Quality (AHRQ). (2015). Pain guidelines. Retrieved July 20, 2015, from http://www.guideline.gov/search/search.aspx?term=pain+guidelines .
2. American Pain Society. (2001). Pain: Current understanding of assessment, management and treatments. American Pain Society and National Pharmaceutical Council. Retrieved from http://www.npcnow.org/system/files/research/download/Pain-Current-Understanding-of-Assessment-Management-and-Treatments.pdf .
3. American Society of Anesthesiologists (ASA) Task Force on Acute Pain Management. (2012). Practice guidelines for acute pain management in the perioperative setting: An updated report by the American Society of Anesthesiologists (ASA) Task Force on Acute Pain Management. Anesthesiology, 116(2), 248–273.
4. Anderson, K. O., Mendoza, T. R., Valero, V., Richman, S. P., Russell, C., Hurley, J., et al. (2000) Minority cancer patients and their providers: Pain management attitudes and practice. Cancer, 88, 1929–1938.
5. Atherton, M. J., Feeg, V. D., & El-Adham, A. F. (2004). Race, ethnicity and insurance as determinants of epidural use: Analysis of a national sample survey. Nursing Economics, 22(1), 6.