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Nishiwaki, S. ; Hirata, T. ; Ueda, H. ; Tsuchiya, Y. ; Sato, T. (1991). Egg −laying Season and Monthly Change in Egg Capsule Production of Clithon retropictus (Prosobranchia : Neritidae）in the Naka River of Izu Peninsula. VENUS (The Japanese Journals of Malacology). 50(3): 197− 201.
Nishiwaki, S. ; Hirata, T. ; Ueda, H. ; Tsuchiya, Y. ; Sato, T. (1991). Egg −laying Season and Monthly Change in Egg Capsule Production of Clithon retropictus (Prosobranchia : Neritidae）in the Naka River of Izu Peninsula. VENUS (The Japanese Journals of Malacology). 50(3): 197− 201.
