Reference
Hans Hagdorn, Edward Gluchowski, Andrzej Boczarowski (1996): The crinoid fauna of the Diplopora Dolomite (Middle Muschelkalk, Upper Anisian) at Piekary Slaskie in Upper Silesia – Geologisch-Paläontologische Mitteilungen Innsbruck – 021: 47 - 87.