@book{steiner-ga228-de,
  author = {Steiner, Rudolf},
  title = {Initiationswissenschaft und Sternenerkenntnis},
  series = {Rudolf Steiner Gesamtausgabe},
  number = {228},
  edition = {3},
  publisher = {Rudolf Steiner Verlag},
  address = {Basel},
  year = {2002},
  pagetotal = {200},
  isbn = {978-3-7274-2280-5},
  language = {german},
}

@book{steiner-ga228-en-rsp1966,
  author = {Steiner, Rudolf},
  title = {Man in the Past, Present, and Future; The Evolution of Consciousness},
  translator = {E. H. Goddard},
  publisher = {Rudolf Steiner Press},
  year = {1966},
  language = {english},
  note = {GA 228; edition code RSP1966},
}

@online{anthroposophyai-ga228,
  author = {Steiner, Rudolf},
  title = {Initiationswissenschaft und Sternenerkenntnis (GA 228), as served by anthroposophy.ai},
  url = {https://anthroposophy.ai/contents/228/},
  urldate = {2026-10-21},
  organization = {anthroposophy.ai},
  note = {Rudolf Steiner, Initiationswissenschaft und Sternenerkenntnis (GA 228), as served by anthroposophy.ai, https://anthroposophy.ai/ga/228/, register entry https://anthroposophy.ai/contents/228/, status as of 2026-10-21: German served; English editions RSP1966.},
}