Bläser-Schulen-Verlag Gemeinsam Lernen 1 Trombone
Bläser-Schulen-Verlag Gemeinsam lernen & spielen 1 Trombone: school for wind class and instrumental lessons, edition for trombone, by Jaap Kastelein and Michiel Oldenkamp, ISMN 9790700382094, BSV 115-013, DIN A4, 72 pages, incl. download code to play-along recordings, in German language