@book{han-nom-d8-agw9-z440,
  title = {Kinh Bắc phong thổ diễn quốc sự 京北風土演國事},
  url = {https://www.viet-dien.com/t/han-nom-d8-agw9-z440/9},
  pages = {9},
  note = {held by Columbia University Libraries},
  urldate = {2026-09-11},
}