American Academy of Family Physicians www.aafp. org

American Academy of Pediatrics www.aap.org

American Medical Association www.ama-assn.org

CDC Prevention and Traveler's Health   www.cdc.gov/travel

Familydoc.org   www.familydoctor.org

Kidshealth   www.kidshealth.org

Longmont United Hospital www.luhcares.org

Mayo Clinic www.mayoclinic.com

National Institute of Health www.nih.gov

Parents Guide to Childhood Immunizations www.cdc.gov/nip/publications/Parents-Guide/default.htm

Questia Online Library   www.questia.com