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