Forsyth, R.G. 2005. Comments on provisional ranks of British Columbia terrestrial molluscs. Unpubl. rep. submitted to the B.C. Minist. Sustainable Resour. Manage., Conservation Data Centre, Victoria, BC. 18pp.
McGraw, R., N. Duncan, and E. Cazares. 2002. Fungi and other items consumed by the blue-gray taildropper slug (Prophysaon coeruleum) and the papillose taildropper slug (Prophysaon dubium). The Veliger 45: 261-264 (Article not seen, citation from Forsyth, R.G. 2004. Land snails of British Columbia. University of British Columbia Press. Vancouver. 176pp.)
Ovaska, K. and L. Sopuck. 2007d. Surveys for the Blue-grey Taildropper within CRD parks and trails system in 2007. Progress report prepared for CRD parks. Victoria, BC. 14pp.
Ovaska, K. and L. Sopuck. 2007e. Surveys for the Blue-grey Taildropper slug (Prophysaon coeruleum) on federal lands on southern Vancouver Island, BC, fall 2007. Report Prepared by Biolinx Environmental Research Ltd. for CFS/CFB Esquimalt Natural Resources Program, Victoria, BC.
Wilke, T. and N. Duncan. 2004. Phylogeographical patterns in the American Pacific Northwest: lessons from the arionid slug Prophysaon coeruleum. Molecular Ecology 13: 2303-2315.
Cross-Linked Information Resources (CLIR): an umbrella search web application that allows users to
use a single window to simultaneously search six provincial environmental and natural resource information
e-libraries and provides access to digital documents in these e-libraries.