Ching, H. L. (1982). Description of germinal sacs of a gymnophallid trematode, Cercaria margaritensis sp. n., in the extrapallial fluid of subtidal snails (Margarites spp.) in British Columbia. Canadian Journal of Zoology. 60 (4): 516–520.
Description of germinal sacs of a gymnophallid trematode, Cercaria margaritensis sp. n., in the extrapallial fluid of subtidal snails (Margarites spp.) in British Columbia