2 literature references for Freyella elegans (Verrill, 1884):

Author: Clark, A.M. and M.E. Downey.
Year: 1992
Title: Starfishes of the Atlantic. Chapman & Hall Identification Guides, 3. Chapman & Hall: London, UK. ISBN 0-412-43280-3. xxvi, 794 pp.
Author: Hansson, H.G.
Year: 2001
Title: Echinodermata, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: