@book{han-nom-d8-32a2-rw42,
  title = {Lạc thiện quốc âm chân kinh 樂善國音眞經},
  year = {1905},
  url = {https://www.viet-dien.com/t/han-nom-d8-32a2-rw42/5},
  pages = {5},
  note = {held by Columbia University Libraries},
  urldate = {2026-09-05},
}