Corns: Fact sheet from the American Academy of Orthopedic Surgeons.
Corns and calluses: Information on corns and calluses from Medline.
Corns and Calluses: Full text article from the American Family Physician.
Corns and calluses: Symptoms, risk factors and advice for treatment.
eMedicine Health: Corns and Calluses: Overview of corns and calluses including causes, symptoms and treatment.