Brain, C., Prave, A., Hoffmann, K.-H., Fallick, A., Botha, A., Herd, D., … Allison, S. (2012). The first animals: ca. 760-million-year-old sponge-like fossils from Namibia. South African Journal of Science, 108(1/2), 8 pages. Retrieved from https://sajs.co.za/article/view/9937