Texier PJ, Porraz G, Parkington J, Rigaud JP, Poggenpoel C, Miller C, Tribolo C, Cartwright C, Coudenneau A, Klein R, Steele T, Verna C. (2010). "A Howiesons Poort tradition of engraving ostrich eggshell containers dated to 60,000 years ago at Diepkloof Rock Shelter, South Africa". Proceedings of the National Acadademy of Science U S A. 107: 6180–6185. doi:10.1073/pnas.0913047107PMID 20194764
Tribolo, C. Mercier, N., Valladas, H. Joron J.L., Guibert P., Lefrais Y., Selo M., Texier P.-J., Rigaud J.-Ph., Porraz G., Poggenpoel C., Parkington J., Texier J.-P., Lenoble A.. (2009) "Thermoluminescence dating of a Stillbay–Howiesons Poort sequence at Diepkloof Rock Shelter (Western Cape, South Africa)". Journal of Archaeological Science, 36: 730–739. doi:10.1016/j.jas.2008.10.018
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ncbi.nlm.nih.gov
Texier PJ, Porraz G, Parkington J, Rigaud JP, Poggenpoel C, Miller C, Tribolo C, Cartwright C, Coudenneau A, Klein R, Steele T, Verna C. (2010). "A Howiesons Poort tradition of engraving ostrich eggshell containers dated to 60,000 years ago at Diepkloof Rock Shelter, South Africa". Proceedings of the National Acadademy of Science U S A. 107: 6180–6185. doi:10.1073/pnas.0913047107PMID 20194764
