The Art of Playing the Recorder. Vol. 2: Breathing and Sound. Composed by Gudrun Heyens. This edition: Saddle stitching. Sheet music. Edition Schott. Classical. Textbook. 48 pages. Schott Music #ED 9762. Published by Schott Music (HL.49013095).
Tune Book 2. Composed by Gudrun Heyens and Gerhard Engel. Edited by Peter Bowman. Arranged by Peter Bowman. This edition: Saddle stitching. Sheet music. Edition Schott. Classical. Performance Book. 92 pages. Schott Music #ED 12706. Published by Schott Music (HL.49012929).
Finger and Tongue Technique. Composed by Gudrun Heyens. This edition: Saddle stitching. Sheet music. Edition Schott. Classical. Instructional book. 80 pages. Schott Music #ED 9761. Published by Schott Music (HL.49013094).