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Gittenberger, E. & Ripken, Th. E. J. (1987). The genus Theba (Mollusca: Gastropoda: Helicidae), systematics and distribution. Zoologische Verhandelingen. 241: 1-59. Leiden [27 November].
Gittenberger, E. & Ripken, Th. E. J. (1987). The genus Theba (Mollusca: Gastropoda: Helicidae), systematics and distribution. Zoologische Verhandelingen. 241: 1-59. Leiden [27 November].
