1. Anon 1985 Admiralty Tide Tables and Tidal Stream Tables Volume 2 Hydrographer of the Navy 4 70
2. A biologically defined exposure scale for the comparative description of rocky shores;Ballantine;Field Studies,1961
3. On the distribution of some common animals and plants along the rocky shores of West Somerset;Crothers;Field Studies,1976
4. Some observations on shell shape variation in North American populations of Nucella lapillus;Crothers;Biological Journal of the Linnean Society,1983