1. Batchelder, C.H.: Migration of Ilyanassa obsoleta, Litorina litorea and Litorina rudis. Nautilus 29, 43?46 (1915)
2. Batschelet, E.: Statistical methods for the analysis of problems in animal orientation and certain biological rhythms, 57 pp. Washington, D.C.: American Institute of Biological Sciences 1965
3. Bequaert, J.C.: The genus Littorina in the Western Atlantic. Johnsonia 1(7), 1?27 (1943)
4. Berry, A.J.: Some factors affecting the distribution of Littorina saxatilis (Olivi). J. Anim. Ecol. 30, 27?45 (1961)
5. Bingham, F.O.: the influence of environmental stimuli on the direction of movement of the supralittoral gastropod Littorina irrorata. Bull. mar. Sci. 22, 309?335 (1972a)