Joyce, A. 1. (2009). The World almanac and book of facts 2009 (Primera edición.). World Almanac Education Group.
Citazione stile Chigago Style (17a edizione)Joyce, Alan 1966. The World Almanac and Book of Facts 2009. Primera edición. Nueva York: World Almanac Education Group, 2009.
Citatione MLA (8a ed.)Joyce, Alan 1966. The World Almanac and Book of Facts 2009. Primera edición. World Almanac Education Group, 2009.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.