@book{han-nom-d8-9re7-5a93,
  title = {Khuyến hiếu thư 勸孝書},
  author = {Trần, Tú Hiên},
  year = {1870},
  url = {https://www.viet-dien.com/t/han-nom-d8-9re7-5a93/5},
  pages = {5},
  note = {held by Columbia University Libraries},
  urldate = {2026-09-06},
}