World Health Organization. (2005). International travel and health: Situation as on 1 January 2005. World Health Organization.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)World Health Organization. International Travel and Health: Situation as on 1 January 2005. Geneva: World Health Organization, 2005.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)World Health Organization. International Travel and Health: Situation as on 1 January 2005. World Health Organization, 2005.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.