MolluscaBase eds. (2021). MolluscaBase.
Helix (Campylaea) standfesti var. trochoidalis Penecke, 1891 †. Accessed through: Marine Species Traits editorial board (2021) Marine Species Traits at: http://marinespecies.org/traits/aphia.php?p=taxdetails&id=1342441 on 2024-05-05
Marine Species Traits editorial board (2024). Marine Species Traits.
Helix (Campylaea) standfesti var. trochoidalis Penecke, 1891 †. Accessed at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1342441 on 2024-05-05