ICC FI 5/2019
International Chronostratigraphic Chart, suomennos v2019/05. http://www.stratigraphy.org/ICSchart/ChronostratChart2019-05Finnish.pdf; Cohen, K.M., Finney, S.C., Gibbard, P.L. & Fan, J.-X. (2013, updated). The ICS International Chronostratigraphic Chart. Episode 36: 199-204.