World Health Organization. (2011). Atlas of headache disorders and resources in the world 2011. World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. Atlas of Headache Disorders and Resources in the World 2011. Geneva, Switzerland: World Health Organization, 2011.
Citatione MLA (8a ed.)World Health Organization. Atlas of Headache Disorders and Resources in the World 2011. World Health Organization, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.