1. Code of Medical Ethics of the American Medical Association: Current Opinions with Annotations, 2006-2007 Edition. Council on Ethical and Judicial Affairs. Annotations prepared by the Southern Illinois University Schools of Medicine and Law.
2. Snyder L, JD, and Leffler C, JD. Ethics Manual, Fifth Edition. Ethics and Human Rights Committee, American College of Physicians. Annals of Internal Medicine. 142(7):560-582, 5 April 2005.
3. Vincent EC et al. What common substances can cause false positives on urine screens for drugs of abuse? The Journal of Family Practice. 55(10):893-897.
4. Verstraete AG. Detection times of drugs of abuse in blood, urine, and oral fluid. Therapeutic Drug Monitoring. 26(2):200-205. April 2004.
5. Osterloh JD and Becker CE. Chemical dependency and drug testing in the workplace. The Western Journal of Medicine. 152(5):506-513. May 1990.