https://archive.org/details/die-dunkle-kraft-1
https://archive.org/details/die-dunkle-kraft-2
https://archive.org/details/kristina-ohlsson-aschenputtel
https://archive.org/details/die-fuenf-plus-eins-schritte-der-verwandlung-nach-robert-betz-marius-lebensimpulse