M.  A. Keen, An abridged check list and bibliography of west North American marine Mollusca. Stanford & London: Stanford University Press & Oxford University Press, 1937, p. 84 [+3].

M.  A. Keen, ?West American mollusk types at the British Museum (Natural History), IV. Carpenter's Mazatlan collection?, The Veliger, vol. 10, pp. 389-439, 1968.

M.  A. Keen, An abridged check list and bibliography of west North American marine Mollusca. Stanford & London: Stanford University Press & Oxford University Press, 1937, p. 84 [+3].

M.  A. Keen, ?West American mollusk types at the British Museum (Natural History), IV. Carpenter's Mazatlan collection?, The Veliger, vol. 10, pp. 389-439, 1968.