Language communities of the Southern Ryukyus 論文集所収 Sachiyo Fujita‐Round ·2022-01-21 ·『Oxford University Press eBooks』 pp. 51-58 doi:10.1093/oso/9780198856610.003.0005
Revitalization of the Ryukyuan Languages 論文集所収 Patrick Heinrich ·2018-03-05 ·pp. 455-463 doi:10.4324/9781315561271-57