Brain, C.; Prave, A.; Hoffmann, K.-H.; Fallick, A.; Botha, A.; Herd, D.; Sturrock, C.; Young, I.; Condon, D.; Allison, S. The First Animals: Ca. 760-Million-Year-Old Sponge-Like Fossils from Namibia. S. Afr. J. Sci. 2012, 108, 8 pages.