References
Bartsch P. 1968. Mollusks. New York : Dover Publications Inc.
O'Clair RM, O'ClairCE. 1998. Southeast Alaska's Rocky Shores Animals. Auke Bay (AK) : Plant Press.
Purchon RD. 1977. The Biology of the Mollusca. 2nd edition. Pergamon Press
White JS. 1976. Seashells of the Pacific Northwest. Portland (OR) : Binford & Mort. Publishing.