@book{steiner-ga13-de,
  author = {Steiner, Rudolf},
  title = {Die Geheimwissenschaft im Umriß (1910)},
  series = {Rudolf Steiner Gesamtausgabe},
  number = {13},
  edition = {32},
  publisher = {Rudolf Steiner Verlag},
  address = {Basel},
  year = {2021},
  pagetotal = {460},
  isbn = {978-3-7274-0131-2},
  language = {german},
}

@book{steiner-ga13-en-ap1972,
  author = {Steiner, Rudolf},
  title = {An Outline of Occult Science},
  translator = {Maud and Henry Monges},
  publisher = {Anthroposophic Press},
  address = {Spring Valley, New York},
  year = {1972},
  pagetotal = {388},
  isbn = {0-88010-368-X},
  language = {english},
  note = {GA 13; edition code AP1972},
}

@book{steiner-ga13-en-rsp1969,
  author = {Steiner, Rudolf},
  title = {Occult Science — An Outline},
  translator = {George and Mary Adams},
  publisher = {Rudolf Steiner Press},
  address = {London},
  year = {1969},
  pagetotal = {377},
  language = {english},
  note = {GA 13; edition code RSP1969},
}

@online{anthroposophyai-ga13,
  author = {Steiner, Rudolf},
  title = {Die Geheimwissenschaft im Umriß (1910) (GA 13), as served by anthroposophy.ai},
  url = {https://anthroposophy.ai/contents/13/},
  urldate = {2026-10-21},
  organization = {anthroposophy.ai},
  note = {Rudolf Steiner, Die Geheimwissenschaft im Umriß (1910) (GA 13), as served by anthroposophy.ai, https://anthroposophy.ai/ga/13/, register entry https://anthroposophy.ai/contents/13/, status as of 2026-10-21: German served; English editions AP1972, RSP1969.},
}