W. P.  Leonard, Richart, C. H., Pearce, T. A., and Hohenlohe, P. A., ?Identification Guide to Land Snails and Slugs of Western Washington?, 2004.

R. G.  Forsyth, Land Snails of British Columbia. Victoria: Royal BC Museum, 2004, p. iv, 188 pp.

W. P.  Leonard, Chichester, L., Richart, C. H., and Young, T. A., ?Securicauda hermani and Carinacauda stormi, two new genera and species of slug from the Pacific Northwest of the United States (Gastropoda: Stylommatophora: Arionidae), with notes on Gliabates oregonius Webb 1959?, Zootaxa, vol. 2746, pp. 43-56, 2011.