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Koike, K. ; Kuniyoshi, S. ; Furuse, K. ; Umezawa, N. ; Masuda, A. ; Nishiwaki, S. (1992). Seasonal Changes in Gametogenesis and Embryo Composition in the Brood Pouch of Semisulcospira libertina(Prosobranchia : Pleuroceridae). VENUS (The Japanese Journals of Malacology). 51(4): 279− 291.
Koike, K. ; Kuniyoshi, S. ; Furuse, K. ; Umezawa, N. ; Masuda, A. ; Nishiwaki, S. (1992). Seasonal Changes in Gametogenesis and Embryo Composition in the Brood Pouch of Semisulcospira libertina(Prosobranchia : Pleuroceridae). VENUS (The Japanese Journals of Malacology). 51(4): 279− 291.