@book{1971murayamakitachishimaainugobunkengakutekikenkyu,
  title = {北千島アイヌ語 : 文献学的研究},
  author = {村山 七郎},
  year = {1971},
  language = {ain},
  url = {https://ndlsearch.ndl.go.jp/books/R100000002-I000001271762}
}