Spier, F. (2015). Big history and the future of humanity (Second edition.). John Wiley & Sons Inc.
Citazione stile Chigago Style (17a edizione)Spier, Fred. Big History and the Future of Humanity. Second edition. Chichester, West Sussex, UK: John Wiley & Sons Inc, 2015.
Citatione MLA (9a ed.)Spier, Fred. Big History and the Future of Humanity. Second edition. John Wiley & Sons Inc, 2015.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.