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.

Cage, John Cage. Notations. West Glover, VT: Something Else Press, 1969.

Ives, Charles. “Text to ten songs with Dutch translations.” In Charles Ives, 115--119, 260--264. Amsterdam, Netherlands: De Bezige Bij, 1969.

Ives, Charles. “Music and Its Future [Muziek en haar Toekomst].” Translated to Dutch by J. Bernlef. In Charles Ives, 104--111. Amsterdam, Netherlands: De Bezige Bij, 1969.

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.

Ives, Charles. “Epilogue from Essays Before a Sonata [Epiloog from Essays voorafgaand ann een sonate].” Translated to Dutch by J. Bernlef. In Charles Ives, 52-92. Amsterdam, Netherlands: De Bezige Bij, 1969.

Bernlef, J. “Charles Ives: Ein Korte Biografi.” In Charles Ives. Amsterdam, Netherlands: De Bezige Bij, 1969.

Bernlef, J and Reinbert de Leeuw. Charles Ives. Amsterdam, Netherlands: De Bezige Bij, 1969.

Boardman, Katherine R. “Ives in Performance: 1900-1950.” Term paper, Yale University, 1969.

Mandel, Alan R. “The Keyboard Works of Charles Ives.” Lecture, American Musicological Society, Saint Louis, Missouri, De-cember 27--29, 1969.