2 literature references for Freyella echinata Sladen, 1889:

Author: Sladen, W.P.
Year: 1889
Title: Report on the Asteroidea. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the years 1873-1876, Zoology 30(51): xlii + 893 pages 118 plates.
Author: Mah, C.L., D.G. McKnight, M.K. Eagle, D.L. Pawson, N. Ameziane, D.J. Vance, A.N. Baker, H.E.S. Clark, and N. Alcock.
Year: 2009
Title: Phylum Echinodermata. In Gordon, D.P. (Ed.) The New Zealand Inventory of Biodiversity. Volume 1. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch; 371-400.