Peng, S., Babcock, L.E. & Cooper, R.A. 2012. Chapter 19 – The Cambrian Period. Teoksessa: Gradstein, F.M., Ogg., J.G., Schmitz, M.D. & Ogg, G.M. (toim.): The Geologic Time Scale 2012, Elsevier, s. 437–488.
