6David Christian, Maps of Time: An Introduction to Big History, Berkeley: University of California Press, 2004, p. 7.
7Fred $pier, Big History and the Future of Humanity, Malden: Wiley-Blaekwell, 2010, p. IX.
8Green, "Periodizing World History," History and Theory, vol. 34, no. 2, ThemeIssue 34 (May 1995), pp. 99 111.
9Justin Jennings, Globalizations and the Ancient World, Cambridge:Cambridge University Press, 2011.
10Kevin H. O'Rourke and Jeffrey G. Williamson, "When Did GlobalisationBegin?" European Review of Economic History, vol. 6, no. 1 (Apr. 2002), pp. 23-50.
