C5-Db5. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 29.
Eb x o o | tr o tr c Eb x o o | x o tr c
C5-Db5. McAuliffe, Joseph. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 64. "Start with Bb key pressed, release to trill."
Eb x o x | x o x c Bb-tr
C5-Db5. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 178.
Eb x tr x | x tr x c Eb x o o | x o o c Bb-tr Eb x o tr | o o tr c
Heckel-System (German) Bassoon Trills and Shakes by Note Names