epOs-Music, 340 pages, numerous colour illustrations, many listening recommendations via QR links to music examples on the internet, local map material and much more. Osnabrück 2024 ISBN 978-3-949888-08-3, 978-3-949888-09-0
Interviews zur individuellen Bedeutung von Musikpräferenzen
epOs-Music, 112 pages, with tables, coloured figures and Interviews (download the pdf-file, view Links) Osnabrück 2022 ISBN 978-3-940255-98-3, 978-3-940255-99-0
Wegweiser-Verlag, 448 pages, Selected and edited for the electronic version by Walter Heise, numerous illustrations Berlin 1930 ISBN -, republished by epOs 1999