American Lung Association: "Facts About Asthma,"
American Academy of Allergy, Asthma & Immunology: "Tips to Remember: Asthma and Allergy Medications," "Allergic Conditions: Asthma Up-To-Date Patient Information: Trigger Avoidance in Asthma," "Tips to Remember: Asthma triggers and Management."
The Canadian Lung Association: "Signs and Symptoms of Asthma: Diagnosis."
National Jewish Medical and Research Center: "How Is Asthma Diagnosed?"
Asthma and Allergy Foundation: "Corticosteroids."