APA-ийн эшлэл(7 дахь хэвлэлт)

Macdougall, J. D. (2008). Nature's clocks: How scientists measure the age of almost everything. University of California Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Macdougall, J. D. Nature's Clocks: How Scientists Measure the Age of Almost Everything. Berkeley: University of California Press, 2008.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Macdougall, J. D. Nature's Clocks: How Scientists Measure the Age of Almost Everything. University of California Press, 2008.