Showers, V. (1979). World facts and figures: A unique, authoritative collection of comparative information about cities, countries, and geographic features of the world. Wiley.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Showers, Victor. World Facts and Figures: A Unique, Authoritative Collection of Comparative Information About Cities, Countries, and Geographic Features of the World. New York: Wiley, 1979.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Showers, Victor. World Facts and Figures: A Unique, Authoritative Collection of Comparative Information About Cities, Countries, and Geographic Features of the World. Wiley, 1979.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.