Yokoyama, M. (1904). On some Jurassic fossils from Rikuzen. <em>Journal of the College of Science, Imperial University of Tokyo.</em> 18, 1-13.[details]
MolluscaBase eds. (2025). MolluscaBase. Trigonia hosourensis Yokoyama, 1904 †. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=854187 on 2025-05-12
Marine Species Traits editorial board (2025). Marine Species Traits. Trigonia hosourensis Yokoyama, 1904 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=854187 on 2025-05-12
original descriptionYokoyama, M. (1904). On some Jurassic fossils from Rikuzen. <em>Journal of the College of Science, Imperial University of Tokyo.</em> 18, 1-13.[details]