- Canadian Mental Health Association: Seasonal Affective Disorder
 - Covers the causes, symptoms, and treatment of SAD. - familydoctor.org: Seasonal Affective Disorder
- Seasonal affective disorder (also called SAD) is a type of depression that follows the seasons. From the American Academy of Family Physicians.
- MayoClinic: Seasonal Affective Disorder
- Explains symptoms, causes, treatment, and coping strategies for people with seasonal affective disorder (SAD).
- MedlinePlus: Seasonal Affective Disorder
- Comprehensive resources about seasonal depression disorder (SAD), treatment, stress management, and related articles.
- NAMI: Seasonal Affective Disorder
- Describes patterns, treatment, and the effect of sunlight on mood.
- Outside In: Seasonal Affective Disorder
- Includes information and symptom scoring table.
- Seasonal Affective Disorder and Light Therapy
- Describes how light therapy can be used to treat the winter depression also known as seasonal affective disorder.
 Seasonal Affective Disorder Association
- Voluntary support organisation informing the public about SAD and advising sufferers.- Seasonal Affective Disorder: Winter Depression
- Information about the condition and light therapy.
- Society for Light Treatment and Biological Rhythms
- Dedicated to fostering research, professional development, and clinical applications in the fields of light therapy and biological rhythms.
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