There are various types of drug references, including: 1. Drug Handbooks: These are comprehensive books that provide detailed information about medications. 2. Electronic Databases: Platforms like Lexicomp, Micromedex, and Epocrates offer up-to-date drug information. 3. Mobile Apps: Applications such as Medscape and Pill Identifier provide quick access to drug information on the go. 4. Online Resources: Websites like Drugs.com and FDA offer reliable drug information.