The Sickle Cell 
Information Center
National Institutes of Health
NCBI
TeensHealth
The MSH Study
US Food & Drug Administration
American Sickle Cell 
Anemia Association
The Gale Encylopedia of Alternative Medicine
1 Up Health
Planet Sickle
MedLine Plus+
University of South Alabama
Comprehensive Sickle Cell Center
Microsoft Encarta Online
KidsHealth
Information Center for Sickle Cell and Thalassemic Disorders
Sickle Cell Disease Association of America