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- Benward, Bruce, and Marilyn Nadine Saker . Music: In Theory and Practice, Vol. 1, seventh edition. Boston: McGraw-Hill. . (en)
- Berry, David Carson, and Sherman Van Solkema . "Theory". The Grove Dictionary of American Music, second edition, edited by Charles Hiroshi Garrett. New York: Oxford University Press. . (en)
- Rubbra, Edmund . "String Quartet No. 2 in E-flat, Op. 73: An Analytical Note by the Composer." The Music Review 14:36–44. (en)
- Hoppin, Richard H. 1978. Medieval Music. New York: W. W. Norton. . (en)
- Forney, Kristine, and Joseph Machlis . The Enjoyment of Music: An Introduction to Perceptive Listening, tenth edition. New York: W. W. Norton. ; ; ; (en)
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