@book{han-nom-d8-nbh4-n317,
  title = {Ngọc hoàng phổ độ tôn kinh quốc âm 玉皇普度尊經國音},
  year = {1936},
  url = {https://www.viet-dien.com/t/han-nom-d8-nbh4-n317},
  note = {held by Columbia University Libraries},
  urldate = {2026-09-09},
}