Bouzouggar, A., Barton, N., Vanhaeren, M., d'Errico , F., Collcutt, S., Higham, T., Hodge, E., Parfitt, S., Rhodes, E., Schwenninger, J.-L., Stringer, C., Turner, E., Ward, S., Moutmir, A. and Stambouli, A. 2007. «82,000-year-old shell beads from North Africa and implications for the origins of modern human behavior» Proceedings of the National Academy of Sciences, June 4, 2007; http://www.pnas.org/cgi/content/abstract/0703877104v1 [Архівовано 18 червня 2008 у Wayback Machine.]
Bouzouggar, A., Barton, N., Vanhaeren, M., d'Errico , F., Collcutt, S., Higham, T., Hodge, E., Parfitt, S., Rhodes, E., Schwenninger, J.-L., Stringer, C., Turner, E., Ward, S., Moutmir, A. and Stambouli, A. 2007. «82,000-year-old shell beads from North Africa and implications for the origins of modern human behavior» Proceedings of the National Academy of Sciences, June 4, 2007; http://www.pnas.org/cgi/content/abstract/0703877104v1 [Архівовано 18 червня 2008 у Wayback Machine.]