@book{steiner-ga2631-de,
  author = {Steiner, Rudolf},
  title = {Rudolf Steiner / Edith Maryon: Briefwechsel},
  series = {Rudolf Steiner Gesamtausgabe},
  number = {263/1},
  edition = {1},
  publisher = {Rudolf Steiner Verlag},
  address = {Basel},
  year = {1990},
  pagetotal = {312},
  isbn = {978-3-7274-2631-5},
  language = {german},
}

@online{anthroposophyai-ga2631,
  author = {Steiner, Rudolf},
  title = {Rudolf Steiner / Edith Maryon: Briefwechsel (GA 263/1), as served by anthroposophy.ai},
  url = {https://anthroposophy.ai/contents/263-1/},
  urldate = {2026-10-20},
  organization = {anthroposophy.ai},
  note = {Rudolf Steiner, Rudolf Steiner / Edith Maryon: Briefwechsel (GA 263/1), as served by anthroposophy.ai, https://anthroposophy.ai/ga/263/, register entry https://anthroposophy.ai/contents/263-1/, status as of 2026-10-20: German served; English editions English.},
}