Lydeard, Charles, Cowie, Robert H., Bogan, A. E., Bouchet, Philippe, Cummings, K. S., Frest, T. J., Herbert, D. G., Hershler, Robert, Gargominy, O., Perez, K., Ponder, W. F., Roth, B., Seddon, M., Strong, Ellen E., and Thompson, F. G. 2004. "The Global Decline of Nonmarine Mollusks." Bioscience. 54:321–330.