Prehistoric art - Seglie, Dario; Otte, Marcel; Oosterbeek, Luís (Archaeopress, 2009)
"Union Internationale des Sciences Prehistoriques et Protohistoriques/International Union for Prehistoric and Protohistoric Sciences, Proceedings of the XV World Congress (Lisbon, 4-9 September 2006)/Actes du XV Congres Mondial (Lisbonne, 4-9 Septembre 2006) Vol. 27, Session C26."