S. M.  Smith, ?Mollusca of rocky shores: Lewis and Harris, Outer Hebrides?, Proc. R. Soc. Edinburgh. Sect. B. Biol. Sci., vol. 77, pp. 173?187, 1979.

J. D.  George, ?The polychaetes of Lewis and Harris with notes on other marine invertebrates?, Proc. R. Soc. Edinburgh. Sect. B. Biol. Sci., vol. 77, pp. 189?216, 2011.