Adam, W.; Van Goethem, J. L. (1978). Revision du sous-genre Parennea Pilsbry du genre Ptychotrema Mörch (Mollusca-Pulmonata-Streptaxidae). <em>Études du Continent Africain.</em> 5: 1-79. page(s): 22, fig. 15. [details] Available for editors
MolluscaBase eds. (2025). MolluscaBase. Ptychotrema (Ennea) kibarae Adam & Van Goethem, 1978. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1307454 on 2025-05-12
Marine Species Traits editorial board (2025). Marine Species Traits. Ptychotrema (Ennea) kibarae Adam & Van Goethem, 1978. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1307454 on 2025-05-12
original descriptionAdam, W.; Van Goethem, J. L. (1978). Revision du sous-genre Parennea Pilsbry du genre Ptychotrema Mörch (Mollusca-Pulmonata-Streptaxidae). <em>Études du Continent Africain.</em> 5: 1-79. page(s): 22, fig. 15. [details] Available for editors