216.25.100.131 (PDF) // the Headache Classification Subcommittee of the International Headache Society. Архивиран от оригинала на 2008-11-27. Посетен на 2011-11-10.
Edlow JA, Panagos PD, Godwin SA, Thomas TL, Decker WW. Clinical policy: critical issues in the evaluation and management of adult patients presenting to the emergency department with acute headache // Ann Emerg Med 52 (4). Октомври 2008. DOI:10.1016/j.annemergmed.2008.07.001. с. 407 – 36.
216.25.100.131 (PDF) // the Headache Classification Subcommittee of the International Headache Society. Архивиран от оригинала на 2008-11-27. Посетен на 2011-11-10.
