Não informado. (1921). Contribution from the Institute of Geology and Paleontology. Tohoku University.
Chicago (17e ed.) BronvermeldingNão informado. Contribution from the Institute of Geology and Paleontology. Sendai, Japão: Tohoku University, 1921.
MLA (8e ed.) BronvermeldingNão informado. Contribution from the Institute of Geology and Paleontology. Tohoku University, 1921.
Let op: Deze citaties zijn niet altijd 100% accuraat.