Herbert D. G. (2002). "Gulella salpinx sp. n., a new critical endangered holoendemic species from the limestone deposits of the Marble Delta, KwaZuluNatal, South Africa (Mollusca: Gastropoda: Streptaxidae)". African Invertebrates43: 125–138. abstractArchived 4 October 2011 at the Wayback Machine.
doi.org
Sutcharit C., Naggs F., Wade C. M., Fontanilla I. & Panha S. (2010). "The new family Diapheridae, a new species of Diaphera Albers from Thailand, and the position of the Diapheridae within a molecular phylogeny of the Streptaxoidea (Pulmonata: Stylommatophora)". Zoological Journal of the Linnean Society160: 1–16. doi:10.1111/j.1096-3642.2009.00598.x.
Emberton K C., Slapcinsky J., Campbell C. A., Rakotondrazafy J. A., Andriamiarison T. N. & Emberton J. D. (2010). "Terrestrial mollusks of Andriantantely Massif, Eastern Madagascar, with descriptions of 36 new species (Gastropoda: Caenogastropoda; Pulmonata)". Archiv für Molluskenkunde139(1): 71–141. doi:10.1127/arch.moll/1869-0963/139/071-141
Emberton K. C. & Griffiths O. L. (2009). "Pulmonate land mollusks from three rainforest transects in northeastern Madagascar: part 1 of 2, with descriptions of 12 new species and one new subspecies (Gastropoda: Pulmonata)". Archiv für Molluskenkunde 138(2): 137–167. doi:10.1127/arch.moll/1869-0963/138/137-167.
Herbert D. (2006). "Rediscovery of the type species of Euonyma (Subulinidae) and observations on South African species of Gulella (Streptaxidae), with description of two new species (Gastropoda: Eupulmonata)". Journal of Natural History40(17–18): 1063–1081. doi:10.1080/00222930600845218.
Bruggen A. C. van (2008). "Studies on the Streptaxidae (Mollusca: Gastropoda Pulmonata) of Malaŵi 10. Description of Gulella systemanaturae, a new species from Dedza Mountain". Zoologische Mededelingen Leiden, 82(2) pp. 9–14. HTMArchived 16 January 2014 at the Wayback Machine, PDF.
schweizerbart.de
Emberton K. C. (2002). "Parvedentulina and edentate Gulella of Madagascar (Gastropoda: Stylommatophora: Streptaxidae)". Archiv für Molluskenkunde 131(1/2): 67–165. abstract.
web.archive.org
Herbert D. G. (2002). "Gulella salpinx sp. n., a new critical endangered holoendemic species from the limestone deposits of the Marble Delta, KwaZuluNatal, South Africa (Mollusca: Gastropoda: Streptaxidae)". African Invertebrates43: 125–138. abstractArchived 4 October 2011 at the Wayback Machine.
Bruggen A. C. van (2008). "Studies on the Streptaxidae (Mollusca: Gastropoda Pulmonata) of Malaŵi 10. Description of Gulella systemanaturae, a new species from Dedza Mountain". Zoologische Mededelingen Leiden, 82(2) pp. 9–14. HTMArchived 16 January 2014 at the Wayback Machine, PDF.
Bruggen A. C. van (2008). "Studies on the Streptaxidae (Mollusca: Gastropoda Pulmonata) of Malaŵi 10. Description of Gulella systemanaturae, a new species from Dedza Mountain". Zoologische Mededelingen Leiden, 82(2) pp. 9–14. HTMArchived 16 January 2014 at the Wayback Machine, PDF.