ebrary, Inc, Lewis, D. S., & Slater, W. (2011). World events 2010. ProQuest.
Cita Chicago (17th ed.)ebrary, Inc, D. S. Lewis, i Wendy Slater. World Events 2010. Ann Arbor, Mich.: ProQuest, 2011.
Cita MLA (9th ed.)ebrary, Inc, et al. World Events 2010. ProQuest, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.