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Ewen, David. “The Eccentrics.” In David Ewen Introduces Modern Music: A History and Appreciation: From Wagner to the Avant--Garde, 51-60. New York, NY: Chilton Publishing, 1969.
Easter, Stanley Eugene. “A Study Guide for the Performance of Twent-ieth Century Music from Selected Ballet Repertoires for Trombones and Tuba.” Ed.D. diss., Columbia University, 1969.
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Ives, Charles. “Foreword to 114 Songs [l’Nawoord bij 114 Songs].” Translated to Dutch by J. Bernlef. In Charles Ives, 93--103. In Charles Ives, 52-92. Amsterdam, Netherlands: De Bezige Bij, 1969.
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