https://archive.org/details/david-neumann-was-ist-wissen
https://archive.org/details/tao-te-king-das-buch-vom-sinn-und-leben-laotse
https://archive.org/details/jochen-kirchhoff-schelling-genie-der-naturphilosophie
https://archive.org/details/was-ist-wirklich-paradoxe-quanten-ein-ausflug-in-das-herz-der-physik
https://archive.org/details/wie-das-patriarchat-in-die-welt-kam-sternstunde-religion-srf-kultur
https://archive.org/details/wolfram-eilenberger-hilft-die-philosophie-beim-glucklichsein