C#4-D4. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 25.
x x tr | o x x F c#-tr
C#4-D4. Ewell, Terry B. (28 April 1995). Source unknown.
x x tr | x o x F# Bb
C#4-D4. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 174.
x x tr | o o x F x x x | x x x F-tr c# x x x | x x x F#-tr x x o | tr o o F# x x tr | o x x (F) c# x x tr | x o o Bb
Heckel-System (German) Bassoon Trills and Shakes by Note Names