@book{steiner-ga321-de,
  author = {Steiner, Rudolf},
  title = {Geisteswissenschaftliche Impulse zur Entwickelung der Physik, II},
  series = {Rudolf Steiner Gesamtausgabe},
  number = {321},
  edition = {5},
  publisher = {Rudolf Steiner Verlag},
  address = {Basel},
  year = {2021},
  pagetotal = {458},
  isbn = {978-3-7274-3211-8},
  language = {german},
}

@book{steiner-ga321-en-mp1980,
  author = {Steiner, Rudolf},
  title = {The Warmth Course},
  translator = {George Adams with editing by Alice Wulsin and Gerld Karnow},
  publisher = {Mercury Press},
  year = {1980},
  language = {english},
  note = {GA 321; edition code MP1980},
}

@online{anthroposophyai-ga321,
  author = {Steiner, Rudolf},
  title = {Geisteswissenschaftliche Impulse zur Entwickelung der Physik, II (GA 321), as served by anthroposophy.ai},
  url = {https://anthroposophy.ai/contents/321/},
  urldate = {2026-11-04},
  organization = {anthroposophy.ai},
  note = {Rudolf Steiner, Geisteswissenschaftliche Impulse zur Entwickelung der Physik, II (GA 321), as served by anthroposophy.ai, https://anthroposophy.ai/ga/321/, register entry https://anthroposophy.ai/contents/321/, status as of 2026-11-04: German served; English editions MP1980.},
}