1. About Generics, Facts at a Glance;General Pharmaceutical Association (GPhA),2012
2. Fast Stats, Therapeutic Drug Use;Center for Disease Control and Prevention (CDC),2011
3. Drug Facts: Nationwide Trends;National Institute on Drug Abuse (NIDA),2012
4. Regulatory Information: Federal Food, Drug, & Cosmetic Act (FD&C Act);U.S. Food and Drug Administration (FDA),2012