https://archive.org/details/du-beginnst-und-endest-jetzt-green-rabbit
https://archive.org/details/richard-david-precht-uber-stoa-philosophie-zufriedenheit-im-kapitalismus-gemuets
https://archive.org/details/die-frage-multiple-persoenlichkeit
https://archive.org/details/hans-peter-duerr-das-geistige-ist-die-treibende-kraft