Willett, G. (1937). Additions to knowledge of the fossil invertebrate fauna of California. <em>Bulletin of the Southern California Academy of Sciences.</em> 36: 61-64.[details]
MolluscaBase eds. (2024). MolluscaBase. Triphora fossilis Willett, 1937 †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1480886 on 2024-09-17
original descriptionWillett, G. (1937). Additions to knowledge of the fossil invertebrate fauna of California. <em>Bulletin of the Southern California Academy of Sciences.</em> 36: 61-64.[details]