Não informado. (1921). Contribution from the Institute of Geology and Paleontology. Tohoku University.
Chicago-Zitierstil (17. Ausg.)Não informado. Contribution from the Institute of Geology and Paleontology. Sendai, Japão: Tohoku University, 1921.
MLA-Zitierstil (8. Ausg.)Não informado. Contribution from the Institute of Geology and Paleontology. Tohoku University, 1921.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.