Helbling Verlag KeyboardClass 1, Course Book for Keyboard, For students from the 5th grade upwards, By Roman Sterzik and Sven Stagge, ISMN 9783862273867, publisher's no. S8739, Format: 21 x 30 cm, 94 Pages, In German, Spiral binding, Incl. code to demo and play-along recordings in the Helbling Media App