D4-E4. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 25.
x tr o | o(x)(x)(F)
D4-E4. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 175.
Eb x tr o | o o o Eb x tr o | o x x F
Heckel-System (German) Bassoon Trills and Shakes by Note Names