D4. Standard. Seltmann, Werner and Angerhöfer, Günter. Fagott-Schule in sechs Bänder, vol. 6 (Mainz: Schott), p. 133. Permission granted for inclusion in this WWW index by Deutcher Verlag für Musik.
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D4. Ewell, Terry B. (05 October 1996). Source unknown.
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D4. Glassburner, Robert R. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 79.
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D4. Jolivet, Michel. The Double Reed 10/3 (Winter 1987): 22.
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D4. Lottridge, Richard. "The Contrabassoon: Let's Get Acquainted." The Instrumentalist 32/10 (May 1978): 66.
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D4. Seltmann, Werner and Angerhöfer, Günter. Fagott-Schule in sechs Bänder, vol. 6 (Mainz: Schott), p. 133-134. Permission granted for inclusion in this WWW index by Deutcher Verlag für Musik.
x x o | o o o c x x o | o x x F c x x o | x x o c Bb