World Health Organization. (2011). Atlas of headache disorders and resources in the world 2011. World Health Organization.
Citace podle Chicago (17th ed.)World Health Organization. Atlas of Headache Disorders and Resources in the World 2011. Geneva, Switzerland: World Health Organization, 2011.
Citace podle MLA (8th ed.)World Health Organization. Atlas of Headache Disorders and Resources in the World 2011. World Health Organization, 2011.
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