Schembri P. J. (1992). «Diversity and conservation of the non-marine molluscs of the Maltese Islands». In: Giusti F. & Manganelli G. (eds.) Abstracts of the Eleventh International Malacological Congress, Siena 1992. pp. 195—198. University of Siena, Siena, Italy. PDF [Архівовано 2016-03-04 у Wayback Machine.].
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Schembri P. J. (1992). «Diversity and conservation of the non-marine molluscs of the Maltese Islands». In: Giusti F. & Manganelli G. (eds.) Abstracts of the Eleventh International Malacological Congress, Siena 1992. pp. 195—198. University of Siena, Siena, Italy. PDF [Архівовано 2016-03-04 у Wayback Machine.].