Gordon, H. (2021). Notes from deep time: A journey through our past and future worlds. Profile Books.
Chicago-referens (17:e uppl.)Gordon, Helen. Notes from Deep Time: A Journey Through Our Past and Future Worlds. London: Profile Books, 2021.
MLA-referens (9:e uppl.)Gordon, Helen. Notes from Deep Time: A Journey Through Our Past and Future Worlds. Profile Books, 2021.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.