@book{1998bronisawpisudskimaterialsforthestudyoftheainulanguageandf,
  title = {Materials for the Study of the Ainu Language and Folklore (Cracow 1912)},
  author = {Bronisław Piłsudski},
  year = {1998},
  url = {https://www.amazon.com/Collected-Bronislaw-Pilsudski-Materials-Language/dp/3110161184}
}