C#3-D#3. Echols, Gary. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 58. Cooper p. 71, first C#-D# trill.

tr x x | o o o
 c# w
    D

C#3-D#3. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 172.

x x tr | o o o(F)
 c# w    (E)
    D

x x tr | o o o
 c# w   Bb
    D

        c#
tr x x | o o o
  c# w
     D

Heckel-System (German) Bassoon Trills and Shakes by Note Names