1. Behrens, S. (1971). The distribution and abundance of the intertidal prosobranchs Littorina sitkana and L. scutulata. M.Sc. thesis, Zoology Department, University of British Columbia. (Abstract in Am. Zool. 10: 540)
2. Behrens, S. (1972). The role of wave impact and desiccation on the distribution of Littorina sitkana (Philippi 1845) Veliger: 129?132
3. Behrens, S. (1974). Ecological interactions of three Littorina (Gastropoda, Prosobranchia) along the west coast of North America. Ph.D. thesis, University of Oregon, Eugene, Oregon
4. Behrens Yamada, S. (1977a). Geographic range limitation of the intertidal gastropods Littorina sitkana and L. planaxis. Mar. Biol. 39: 61?65
5. Behrens Yamada, S. (1977b). Range extension in Littorina sitkana (Philippi 1845) and range contraction in L. planaxis (Philippi 1847). Veliger 19: 368