APA-referens (7:e uppl.)
Macdougall, J. D. (2008). Nature's clocks: How scientists measure the age of almost everything. University of California Press.
Chicago-referens (17:e uppl.)
Macdougall, J. D. Nature's Clocks: How Scientists Measure the Age of Almost Everything. Berkeley: University of California Press, 2008.
MLA-referens (9:e uppl.)
Macdougall, J. D. Nature's Clocks: How Scientists Measure the Age of Almost Everything. University of California Press, 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.