E.Clarkson, E.N.K. Clarkson, Invertebrate Palaeontology and Evolution. Wiley-Blackwell; 4.ed. (1998) Grzimek's Animal Life Encyclopedia, vol 1, Gale Cengage 2003 R.C.Brusca, G.J.Brusca. Invertebrates. Sinauer Associates, 2 ed.(2003) Smith, A.B.; Paterson, G.L.J. . Ophiuroid phylogeny and higher taxonomy: morphological, molecular and palaeontological perspectives. Zool. J. Linn. Soc. 114 (1995)
