APA
WHO, . (2016). Persisting Pain in Children Package: WHO Guidelines on Pharmacological Treatment of Persisting Pain in Children with Medical Illnesses. Switzeland: WHO.
Chicago
WHO, . 2016. Persisting Pain in Children Package: WHO Guidelines on Pharmacological Treatment of Persisting Pain in Children with Medical Illnesses. Switzeland: WHO.
Harvard
WHO, . (2016). Persisting Pain in Children Package: WHO Guidelines on Pharmacological Treatment of Persisting Pain in Children with Medical Illnesses. Switzeland: WHO.
MLA
WHO, . Persisting Pain in Children Package: WHO Guidelines on Pharmacological Treatment of Persisting Pain in Children with Medical Illnesses. Switzeland: WHO. 2016.