Monograph on the British fossil Echinodermata from the Cretaceous formations. – London : [s. n.], 1864. – (The Monographies of the Paleontographical society) . Книга 131 14946
Vol.2 : The Asteroidea and Ophiuroidea. P.5: Title-page and index / W. K. Spencer. – 1908. – P.133-138.