The Oxford Guide to the Transeurasian Languages 図書 Robbeets, Martine・Savelyev, Alexander ·2020-06-30 ·『Oxford University Press eBooks』 doi:10.1093/oso/9780198804628.001.0001
Language Communities in Japan 図書 ·2022-01-21 ·『Oxford University Press eBooks』 doi:10.1093/oso/9780198856610.001.0001