The Pre-Historical Period - Summary of pre-historical period of Namibia with special emphasis on Rock Art by Klaus Dierks. - http://www.klausdierks.com/Chronology/1.htm
Ancestral Bushman (San) Rock Art - Overview of Rock Art by the San People in Southern Africa. - http://www.lonker.net/art_african_1.htm
Southern African rock art - Rock art at Rice is an introduction to prehistoric and historic rock art with an emphasis on pictographs (paintings) and petroglyphs (engravings. - http://www.ruf.rice.edu/~raar/RegionsSAarticle.html
Rock Art at Süderecke, Namibia - Photo's and description of Rock Art at the Südenecke site. - http://mc2.vicnet.net.au/home/vhra/web/suderecke.html
Southern African Rock-Art Sites - Overview and relationship report on rock art sites in Southern Africa by Janette Deacon, in collaboration with members of the Southern African Rock Art Project. - http://www.icomos.org/studies/sarockart.htm
Rock Art of Twyfelfontein, Namibia - A Survey into the Relationship between Animal-Engravings and Cupules By Maarten van Hoek. Including the Site Report on Twyfelfontein by Sven Ouzman - http://www.bradshawfoundation.com/twyfelfontein/
Twyfelfontein Rock Art Photos - Photo gallery of Twyfelfontein rock engravings. - http://www.phototravels.net/namibia/damaraland-twyfelfontein.html
Index to Twyfelfontein - Links to several research projects and concerns in respect to the Twyfelfontein rock art. - http://www.arch.soton.ac.uk/Research/Gidlow/