Wilford, John Noble (13 октомври 2011) "In African Cave, Signs of an Ancient Paint Factory"The New York Times; hardcopy published 14 октомври 2011 under title „African Cave, Ancient Paint Factory Pushes Human Symbolic Thought ‘Far Back’“ New York edition page A-14
Jockenhövel, Albrecht et al. (1997) "Archaeological Investigations on the Beginning of Blast Furnace-Technology in Central Europe" Abteilung für Ur- und Frühgeschichtliche Archäologie, Westfälische Wilhelms-Universität Münster; abstract published as: Jockenhövel, A. (1997) „Archaeological Investigations on the Beginning of Blast Furnace-Technology in Central Europe“ pp. 56 – 58 In Crew, Peter and Crew, Susan (editors) (1997) Early Ironworking in Europe: Archaeology and Experiment: Abstracts of the International Conference at Plas Tan y Bwlch 19 – 25 Sept. 1997 (Plas Tan y Bwlch Occasional Papers No 3) Snowdonia National Park Study Centre, Gwynedd, Wales
