Spier, F. (2015). Big history and the future of humanity (Second edition.). John Wiley & Sons Inc.
Chicago-viite (17. p.)Spier, Fred. Big History and the Future of Humanity. Second edition. Chichester, West Sussex, UK: John Wiley & Sons Inc, 2015.
MLA-viite (9. p.)Spier, Fred. Big History and the Future of Humanity. Second edition. John Wiley & Sons Inc, 2015.
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