S. M.  Stanley, ?Aspects of the adaptive morphology and evolution of the Trigoniidae?, Philosophical Transactions of the Royal Society of London Series B-Biological Sciences, vol. 284, pp. 247-258, 1978.

D. M.  Raup and Stanley, S. M., Principles of paleontology, 2nd ed. New York: W. H. Freeman and Company, 1978, p. 481.