^Martin, M. W.; Grazhdankin, D. V; Bowring, S. A; Evans, D. A; Fedonkin, M. A; Kirschvink, J. L. Age of Neoproterozoic bilatarian [sic] body and trace fossils, White Sea, Russia: implications for metazoan evolution. Science. 5 May 2000, 288 (5467): 841–5. Bibcode:2000Sci...288..841M. PMID 10797002. doi:10.1126/science.288.5467.841.
^ 2.02.1Jaume Baguñà and Marta Riutort, 2004. The dawn of bilaterian animals: the case of acoelomorph flatworms, Bioessays 26 (10): 1046-1057 Oct 2004