Yokoyama, M. (1891). On some Cretaceous fossils from Shikoku. <em>Journal of the College of Science, Imperial University of Tokyo.</em> 4, 357-366.[details]
MolluscaBase eds. (2025). MolluscaBase. Trigonia rotundata Yokoyama, 1891 †. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=854188 on 2025-05-10
Marine Species Traits editorial board (2025). Marine Species Traits. Trigonia rotundata Yokoyama, 1891 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=854188 on 2025-05-10
original descriptionYokoyama, M. (1891). On some Cretaceous fossils from Shikoku. <em>Journal of the College of Science, Imperial University of Tokyo.</em> 4, 357-366.[details]