During the following years Carroll authored esoteric literature. Since 1997, his books have been published in small esoterically minded publishing houses like Ostergaard Verlag, which brought out the Kryon textbook serial<ref>http://www.ostergaardverlag.de/buecher.html (german)</ref>, Koha Verlag <ref>http://www.koha-verlag.de/koha/autoren/detail.html?id=carroll_lee (german)</ref>, but also with Ullstein. | During the following years Carroll authored esoteric literature. Since 1997, his books have been published in small esoterically minded publishing houses like Ostergaard Verlag, which brought out the Kryon textbook serial<ref>http://www.ostergaardverlag.de/buecher.html (german)</ref>, Koha Verlag <ref>http://www.koha-verlag.de/koha/autoren/detail.html?id=carroll_lee (german)</ref>, but also with Ullstein. |