P. Cleveringa, T. Meijer, R.J.W. van Leeuwen, H. de Wolf, R. Pouwer, T. Lissenberg and A.W. Burger 2000. The Eemian stratotype locality at Amersfoort in the central Netherlands: a re-evaluation of old and new data. Netherlands Journal of Geosciences. 79, (Aug. 2000), 197 - 216. DOI:https://doi.org/10.1017/S0016774600023659.