World Health Organization. (2012). WHO guidelines on the pharmacological treatment of persisting pain in children with medical illness. World Health Organization.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)World Health Organization. WHO Guidelines on the Pharmacological Treatment of Persisting Pain in Children with Medical Illness. Geneva, Switzerland: World Health Organization, 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)World Health Organization. WHO Guidelines on the Pharmacological Treatment of Persisting Pain in Children with Medical Illness. World Health Organization, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.