APA-viite (7. p.)
Christian, D. (2004). Maps of time: An introduction to big history. University of California Press.
Chicago-viite (17. p.)
Christian, David. Maps of Time: An Introduction to Big History. Berkeley: University of California Press, 2004.
MLA-viite (9. p.)
Christian, David. Maps of Time: An Introduction to Big History. University of California Press, 2004.
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