Spier, F. (2015). Big history and the future of humanity (Second edition.). John Wiley & Sons, Ltd.
Chicago-viite (17. p.)Spier, Fred. Big History and the Future of Humanity. Second edition. Chichester, West Sussex, UK: John Wiley & Sons, Ltd, 2015.
MLA-viite (8. p.)Spier, Fred. Big History and the Future of Humanity. Second edition. John Wiley & Sons, Ltd, 2015.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.