Arnqvist, G., L. Rowe, J. J. Krupa & A. Sih, 1996. Assortative mating by size: a meta-analysis of mating patterns in water-striders. Evol. Ecol. 10: 265–284.
Barton, N. H. & G.M. Hewitt, 1985. Analysis of hybrid zones. Ann. Rev. Ecol. Syst. 15: 133–164.
Butlin, R., 1987. Speciation by re-inforcement. TREE 2: 8–13.
Butlin, R., 1989. Reinforcement of Premating Isolation. In D. Otte & J. A. Endler (eds), Speciation and its Consequences. Sinauer, Sunderland, Mass., U.S.A.: 158–179.
Crespi, B. J., 1989. Causes of assortative mating in arthropods. Anim. Behav. 38: 980–1000.
Diehl, S. R. & G. L. Bush, 1989. The Role of Habitat Preference in Adaptation and Speciation. In D. Otte & J. A. Endler (eds), Speciation and its Consequences. Sinauer, Sunderland, Mass., U.S.A.: 345–365.
Erlandsson, J. & K. Johannesson, 1994. Sexual selection on female size in a marine snail, Littorina littorea (L.). J. exp. mar. Biol. Ecol. 181: 145–157.
Erlandsson, J. & V. Kostylev, 1995. Trail following, speed and fractal dimension of movement in a marine prosobranch, Littorina littorea, during a mating and a non-mating season. Mar. Biol. 122: 87–94.
Gilbert, D. G. & W. T. Starmer, 1985. Statistics of sexual isolation. Evolution 39: 1380–1383.
Grahame, J., S. L. Hull, P. J. Mill & R. Hemmingway, 1997. Discovering unrecognised diversity among marine molluscs. In Ormond, R. F. G., J. D. Gage & M. V. Angel (eds), Marine Biodiversity: Patterns and Processes. Cambridge University Press: 293–318.
Hull, S. L., 1994. Polymorphism, physiological ecology and the systematics of Littorina. Unpublished Ph.D. thesis, University of Leeds.
Hull, S. L., J. Grahame & P. J. Mill, 1996. Morphological divergence and evidence for reproductive isolation in Littorina saxatilis (Olivi) in northeast England. J. moll. Stud. 62: 89–99.
Janson, K., 1983. Selection and migration in two distinct phenotypes of Littorina saxatilis in Sweden. Oecologia 59: 58–61.
Janson, K., 1985. Variation in the occurrence of abnormal embryos in the females of the intertidal gastropod Littorina saxatilis Olivi. J. moll. Stud. 51: 64–68.
Janson, K. & P. Sundberg, 1983. Multivariate morphometric analysis of two varieties of Littorina saxatilis from the Swedish west coast. Mar. Biol. 74: 49–53.
Johannesson, K., B. Johannesson & E. Rolan-Alvarez, 1993. Morphological differentiation and genetic cohesiveness over a microenvironmental gradient in the marine snail Littorina saxatilis. Evolution 47: 1770–1787.
Johannesson, K., E. Rolan-Alvarez & A. Ekendahl, 1995. Incipient reproductive isolation between two sympatric morphs of the intertidal snail Littorina saxatilis (Olivi). Evolution 49: 1180–1190.
Palumbi, S. R., 1994. Genetic divergence, reproductive isolation and marine speciation. Ann. Rev. Ecol. Syst. 25: 547–572.
Raffaelli, D. G., 1977. Observations on the copulatory behaviour of Littorina rudis (Maton) and Littorina nigrolineata (Gray). Veliger 20: 75–77.
Ribi, G. & A. H. Porter, 1996. Mating between two hybridising species, Viviparous ater and V. contectus (Mollusca: Prosobranchia). Anim. Behav. 49: 1389–1398.
Ridley, M., 1993. Evolution. Blackwell Scientific Publications, New York, 670 pp.
Roberts, D. J. & R. N. Hughes, 1981. Growth and reproductive rates of Littorina rudis from three contrasted shores in North Wales, U.K. Mar. Biol. 58: 47–54.
Rolan-Alvarez, E., K. Johannesson & A. Ekendahl, 1995. Frequency and density-dependent selection in natural populations of Littorina saxatilis (Olivi). Hydrobiologia 309: 167–172.
Rolan-Alvarez, E., E. Rolan & K. Johannesson, 1996. Differentiation in radular and embryonic characters, and further comhyments on gene flow, between two sympatric morphs of Littorina saxatilis (Olivi). Ophelia 45: 1–15.
Ross, B. & A. J. Berry, 1991. Annual and lunar reproductive cycles in Littorina saxatilis (Olivi) and differences between breeding in the marine Firth of Forth and the Forth Estuary. J. moll. Stud. 57: 347–358.
Saur, M., 1990. Mate discrimination in Littorina littorea (L.) and Littorina saxatilis (Olivi) (Mollusca: Prosobranchia). Hydrobiologia 193: 261–270.
Warwick, T., 1982. A method of maintaining and breeding members of the Littorina saxatilis (Olivi) species complex. J. moll. Stud. 48: 368–370.