Macdougall, J. D. (2008). Nature's clocks: How scientists measure the age of almost everything. University of California Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMacdougall, J. D. Nature's Clocks: How Scientists Measure the Age of Almost Everything. Berkeley: University of California Press, 2008.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMacdougall, J. D. Nature's Clocks: How Scientists Measure the Age of Almost Everything. University of California Press, 2008.
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