F3-G3. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 23. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 173.

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F3-G3. Corey, Gerald. To the World's Bassoonists 5/1 (1975): 5.

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F3-G3. Ewell, Terry B. (28 April 1995). Source unknown.

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