@book{steiner-ga381-de,
  author = {Steiner, Rudolf},
  title = {Sämtliche Briefe. Band 1: Wiener Zeit 1879 – 28. September 1890},
  series = {Rudolf Steiner Gesamtausgabe},
  number = {38/1},
  edition = {1},
  publisher = {Rudolf Steiner Verlag},
  address = {Basel},
  year = {2021},
  pagetotal = {500},
  isbn = {978-3-7274-0381-1},
  language = {german},
}

@online{anthroposophyai-ga381,
  author = {Steiner, Rudolf},
  title = {Sämtliche Briefe. Band 1: Wiener Zeit 1879 – 28. September 1890 (GA 38/1), as served by anthroposophy.ai},
  url = {https://anthroposophy.ai/contents/38-1/},
  urldate = {2026-10-20},
  organization = {anthroposophy.ai},
  note = {Rudolf Steiner, Sämtliche Briefe. Band 1: Wiener Zeit 1879 – 28. September 1890 (GA 38/1), as served by anthroposophy.ai, https://anthroposophy.ai/ga/38-1/, register entry https://anthroposophy.ai/contents/38-1/, status as of 2026-10-20: German via earlier edition.},
}