• William J. Duiker and Jackson J. Spielvogel.  The Essential World History: to 1800. (Fifth Edition) Thomson/Wadsworth,  2nd edition, 2007.
• David Christian. Maps of Time: An Introduction to Big History, University of California Press, 2004.
• Kevin Reillly. Worlds of History, A Comparative Reader, vol. 1, Bedford/St. Martin, 2007.