Edition Dux Technik & Lesen: exercise book for a better hand and foot technique and for sight-reading, by Gerwin Eisenhauer, from the series “Bum Bum Tschack”, ISBN 9783868494181, ISMN 9790500175919, D 421, 23 x 30 cm, 60 pages, incl. audio download & video links, in German language