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Hooper, J.N.A.; Van Soest, R.W.M. (2002 (2004)). Family Spirasigmidae Hallmann, 1912. Pp. 102-104. In: Hooper, J.N.A.; van Soest, R.W.M. (Eds.) Systema Porifera: a guide to the classification of sponges. (2 Volumes). Kluwer Academic/ Plenum Publishers: New York, Boston, Dordrecht, London, Moscow). 1708+xvliii. ISBN 978-1-4615-0747-5 (eBook electronic version).
Hooper, J.N.A.; Van Soest, R.W.M. (2002 (2004)). Family Spirasigmidae Hallmann, 1912. Pp. 102-104. In: Hooper, J.N.A.; van Soest, R.W.M. (Eds.) Systema Porifera: a guide to the classification of sponges. (2 Volumes). Kluwer Academic/ Plenum Publishers: New York, Boston, Dordrecht, London, Moscow). 1708+xvliii. ISBN 978-1-4615-0747-5 (eBook electronic version).
