https://archive.org/details/so-starkst-du-deinen-selbstwert-die-effektivsten-methoden-erklar-mir-die-welt
https://archive.org/details/arte-die-kelten-1-europas-vergessene-macht
https://archive.org/details/arte-die-kelten-2-kampf-um-gallien
https://archive.org/details/arte-die-kelten-3-aufstand-der-konigin
https://archive.org/details/die-magie-eines-rohstoffs-salz-arte