Ptychostylus

Bandel, K. (1991). Gastropods from brackish and fresh water of the Jurassic-Cretaceous transition (a systematic reevaluation). <em>Berliner Geowissenschaftliche Abhandlungen, Serie A.</em> 134: 9−55, pls. 1−7.

Sandberger, C.L.F. (1870-1875). <i>Die Land- und Süßwasser-Conchylien der Vorwelt</i>. C. W. Kreidel, Wiesbaden. [pp. 1-96, pl. 1-12 (1870); pp. 97-160, pl. 13-20 (1871); pp. 161-256, pl. 21-32 (1872); pp. 257-352, pl. 33-36 (1873); pp i-viii, 353-1000 (1875)].