Cita APA (7th ed.)

ebrary, Inc, & Levin, M. (2008). Comprehensive review of headache medicine. Oxford University Press.

Cita Chicago (17th ed.)

ebrary, Inc, i Morris Levin. Comprehensive Review of Headache Medicine. Oxford ; New York: Oxford University Press, 2008.

Cita MLA (9th ed.)

ebrary, Inc, i Morris Levin. Comprehensive Review of Headache Medicine. Oxford University Press, 2008.