Bruggen, A. C. van. (1998). Vallonia costata (Müll.) (Gastropoda Pulmonata) in South Africa, with aditional notes on other alien species. Basteria. 61: 85-57. Leiden.
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Bruggen, A. C. van
1998
<i>Vallonia costata</i> (Müll.) (Gastropoda Pulmonata) in South Africa, with aditional notes on other alien species