@book{ainu1ainuyukarai,
  title = {アイヌ歌謠集 第１集 アイヌ英雄叙事詩 ユーカラ（Ⅰ）},
  year = {1947},
  language = {ain},
  url = {https://dl.ndl.go.jp/pid/3578910}
}