D. C.  Campbell, Hoekstra, K. J., and Carter, J. G., ?18S ribosomal DNA and evolutionary relationships within the Bivalvia?, in Bivalves: an eon of evolution - paleobiological studies honoring Norman D. Newell, P. A.  Johnston and Haggart, J. W., Eds. Calgary: University of Calgary Press, 1998, pp. 75-85.

D. C.  Campbell, Hoekstra, K. J., and Carter, J. G., ?18S ribosomal DNA and evolutionary relationships within the Bivalvia?, in Bivalves: an eon of evolution - paleobiological studies honoring Norman D. Newell, P. A.  Johnston and Haggart, J. W., Eds. Calgary: University of Calgary Press, 1998, pp. 75-85.