PISERA, Andrzej and
Šárka HLADILOVÁ. Siliceous Sponge Spicules from the Karpatian of the Carpathian Foredeep in Moravia. In
Brzobohatý R., Cicha I., Kováč M., Rogl F. Eds: The Karpatian a Lower Miocene Stage of the Central Paratethys. 1st ed. Masaryk University Brno: Gloria Rosice, 2003, p. 189-192. ISBN 80-210-3266-9.