Viau, André E.; Gajewski, Konrad; Fines, Philippe; Atkinson, David E.; Sawada, Michael C. (1 May 2002). "Widespread evidence of 1500 yr climate variability in North America during the past 14 000 yr". Geology. 30 (5): 455–458. Bibcode:2002Geo....30..455V. doi:10.1130/0091-7613(2002)030<0455:WEOYCV>2.0.CO;2.
Viau, André E.; Gajewski, Konrad; Fines, Philippe; Atkinson, David E.; Sawada, Michael C. (1 May 2002). "Widespread evidence of 1500 yr climate variability in North America during the past 14 000 yr". Geology. 30 (5): 455–458. Bibcode:2002Geo....30..455V. doi:10.1130/0091-7613(2002)030<0455:WEOYCV>2.0.CO;2.
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Gibbard, P. L.; Head, M. J. (2020-01-01), Gradstein, Felix M.; Ogg, James G.; Schmitz, Mark D.; Ogg, Gabi M., ed., "Chapter 30 - The Quaternary Period", Geologic Time Scale 2020 (dalam bahasa Inggris), Elsevier, hlm. 1217–1255, ISBN978-0-12-824360-2, diakses tanggal 2022-04-21