@book{steiner-ga223-de,
  author = {Steiner, Rudolf},
  title = {Der Jahreskreislauf als Atmungsvorgang der Erde und die vier großen Festeszeiten},
  series = {Rudolf Steiner Gesamtausgabe},
  number = {223},
  edition = {7},
  publisher = {Rudolf Steiner Verlag},
  address = {Basel},
  year = {1990},
  pagetotal = {184},
  isbn = {978-3-7274-2231-7},
  language = {german},
}

@book{steiner-ga223-en-ap1984,
  author = {Steiner, Rudolf},
  title = {The Cycle of the Year as Breathing-Process of the Earth},
  translator = {Barbara D. Betteridge and Frances E. Dawson},
  publisher = {Anthroposophic Press},
  year = {1984},
  language = {english},
  note = {GA 223; edition code AP1984},
}

@online{anthroposophyai-ga223,
  author = {Steiner, Rudolf},
  title = {Der Jahreskreislauf als Atmungsvorgang der Erde und die vier großen Festeszeiten (GA 223), as served by anthroposophy.ai},
  url = {https://anthroposophy.ai/contents/223/},
  urldate = {2026-10-21},
  organization = {anthroposophy.ai},
  note = {Rudolf Steiner, Der Jahreskreislauf als Atmungsvorgang der Erde und die vier großen Festeszeiten (GA 223), as served by anthroposophy.ai, https://anthroposophy.ai/ga/223/, register entry https://anthroposophy.ai/contents/223/, status as of 2026-10-21: German served; English editions AP1984.},
}