Burch, J. B. 1960a. Chromosomes of Gyraulus circumstriatus, a fresh water snail. Nature 186: 497-498.
Burch, J. B. 1960b. Chromosome numbers of schistosome vector snails. Z. tropenmed. Prarasitol. 2: 449-452.
Burch, J. B. 1965. Chromosome numbers and systematics in euthyneuran snails. Proc. first Europ. malacol. Congr., 1962, pp. 215-241.
Fraga de Azevedo, J. and Goncalves, M. M. 1956. Ensaios sobre o estudo da numeracao cromosómìca de algumas especies de moluscos de água doce. An. Inst. Med. Trpo. 13 (4): 569-577.
Narang, N. 1974. Cytogentic effects of radiation on the planorbid snail Biomphalaria glabrata. Caryologia 27 (4): 385-393.