L.  A. McAlester, ?Mode of preservation in early paleozoic pelecypods and its morphologic and ecologic significance?, Journal of Paleontology, vol. 36, pp. 69-73, 1962.

L.  A. McAlester, ?Mode of preservation in early paleozoic pelecypods and its morphologic and ecologic significance?, Journal of Paleontology, vol. 36, pp. 69-73, 1962.