(1995a). The marine fauna of the British Isles and north-west Europe. Volume 2. Molluscs to Chordates. Oxford Science Publications. Oxford: Clarendon Press.
(1997). The species directory of the marine fauna and flora of the British Isles and surrounding seas. Belfast: Ulster Museum. [Ulster Museum publication, no. 276.]
(1999). Marine Environment Resource Mapping And Information Database (MERMAID): Marine Nature Conservation Review Survey Database. [on-line] http://www.jncc.gov.uk/mermaid,
(2002). National Biodiversity Network gateway. http://www.searchnbn.net, 2008-10-31 00:00:00
(1994). A Field Guide to the Nudibranchs of the British Isles. London: Immel Publishing Ltd.
(1976). British Opisthobranch Molluscs. London: Academic Press. [Synopses of the British Fauna, no. 8.]