@book{steiner-ga109-de,
  author = {Steiner, Rudolf},
  title = {GA 109/111},
  series = {Rudolf Steiner Gesamtausgabe},
  number = {109},
  edition = {4},
  publisher = {Rudolf Steiner Verlag},
  address = {Basel},
  year = {2021},
  pagetotal = {308},
  isbn = {978-3-7274-1091-8},
  language = {german},
}

@book{steiner-ga109-en-ap1986,
  author = {Steiner, Rudolf},
  title = {The Principle of Spiritual Economy},
  translator = {Peter Mollenhauer},
  publisher = {Anthroposophic Press},
  year = {1986},
  language = {english},
  note = {GA 109; edition code AP1986},
}

@online{anthroposophyai-ga109,
  author = {Steiner, Rudolf},
  title = {GA 109/111 (GA 109), as served by anthroposophy.ai},
  url = {https://anthroposophy.ai/contents/109/},
  urldate = {2026-10-21},
  organization = {anthroposophy.ai},
  note = {Rudolf Steiner, GA 109/111 (GA 109), as served by anthroposophy.ai, https://anthroposophy.ai/ga/109/, register entry https://anthroposophy.ai/contents/109/, status as of 2026-10-21: German served; English editions AP1986.},
}