Valerie A. Cappola & Daphne G. Fautin 2000 All three species of Ptychodactiaria belong to order Actiniaria (Cnidaria: Anthozoa) Journal of the Marine Biological Association of the UK, 80:6:995-1005 Brusca, R.C. & Brusca, G.J. 2002. Invertebrates Second Edition Sinauer Associates.
ISBN 0-87893-097-3 http://marinespecies.org/aphia.php?p=taxdetails&id=367227 accessed 10 June 2011
