International Headache Society, issuing body. (1981). Cephalalgia. Universitetsforlaget.
Cita Chicago Style (17a ed.)International Headache Society, issuing body. Cephalalgia. Oslo: Universitetsforlaget, 1981.
Cita MLA (9a ed.)International Headache Society, issuing body. Cephalalgia. Universitetsforlaget, 1981.
Precaución: Estas citas no son 100% exactas.
