B. L.  Burch, ?Pearly shells - part 5: transport by man of commercial pearl shells and their hitch-hikers?, Hawaiian Shell News, vol. 43 (New Series 426), p. 3, 6, 1995.

B. L.  Burch, ?Pearly shells - part 5: transport by man of commercial pearl shells and their hitch-hikers?, Hawaiian Shell News, vol. XLIII (New, p. 3, 6, 1995.