Further reading list
The International Classification of Headache Disorders. Cephalalgia 2004; 24:1–160.
Wolff's Headache, 8th edn. New York, NY: Oxford University Press, 2008: 29–43.
, , Overview of diagnosis and classification. In Silberstein SD, Lipton RB, Dodick DW, Eds.
The history and examination of headache patients. In , , , , , Eds. The Headaches, 3rd edn. Philadelphia, PA: Lippincott Williams and Wilkins, 2006: 43–53.