Showers, V. (1979). World facts and figures: A unique, authoritative collection of comparative information about cities, countries and geographic features of the world. John Wiley & Sons.
Chicago-Zitierstil (17. Ausg.)Showers, Victor. World Facts and Figures: A Unique, Authoritative Collection of Comparative Information About Cities, Countries and Geographic Features of the World. New York [i 3 pozostałe]: John Wiley & Sons, 1979.
MLA-Zitierstil (9. Ausg.)Showers, Victor. World Facts and Figures: A Unique, Authoritative Collection of Comparative Information About Cities, Countries and Geographic Features of the World. John Wiley & Sons, 1979.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.