- Medicinenet Symptom Checkerwww.medicinenet.com
- Find a Doctorwww.zocdoc.com
- Physicidans Desk Referencewww.pdr.net
- Web MDwww.webmd.com
- World Health Organizationwww.who.int
- Drugs.comwww.drugs.com
- American Pharmacists Associationwww.pharmacist.com
- Canada’s Food and Drugs Act and Regulations – Health Canada www.hc-sc.gc.ca
- Consumer Healthcare Products Association www.chpa-info.org
