Herbert, D.G. & Kilburn R.N. (1991). The occurrence of Pisulina (Neritidae) and Neritopsis (Neritopsidae) in southern Africa (Mollusca: Gastropoda: Neritoidea). Annals of the Natal Museum 32: 319–323.
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Herbert, D.G. & Kilburn R.N.
1991
The occurrence of Pisulina (Neritidae) and Neritopsis (Neritopsidae) in southern Africa (Mollusca: Gastropoda: Neritoidea).