1. James C. Carlsen. “An Investigation of Programmed Learning in Melodic Dictation by Means of a Teaching Machine Using a Branching Technique of Programming”, unpublished Ph.D. dissertation, Northwestern University, 1962.
2.
2. James C. Carlsen. “The Effects of Added Practice on the Perception of Melody”, unpublished report of a research project, 1968.
3.
3. James C. Carlsen., “Programed Learning in Melodic Dictation”, Journal of Research in Music Education, XII (Summer 1964), 139–148.
4.
4. Frank B. Cookson. Recordings and Self-Tutoring. Cleveland: The Brush Development Co., 1949.
5.
5. Norman A. Crowder. “Authentic Tutoring by Means of Intrinsic Programming”, Automatic Teaching: The State of the Art, Eugene Galanter, ed. New York: John Wiley and Sons, 1959. pp. 45–46.
6.
6. Thomas F. Gilbert, “Mathematics: The Technology of Education”, The Journal of Mathematics, I (January 1962), 7–73.
7.
7. Sidney L. Pressey, “A Simple Apparatus which Gives Tests and Scores—and Teaches”, School and Society, XXV (May 7, 1927), 549–552.
8.
8. B. F. Skinner, “Teaching Machines”, Science, CXXVIII (October 24, 1958), 969–977.
9.
9. Charles L. Spohn, Jr. “An Exploration in the Use of Recorded Teaching Material to Develop Aural Comprehension in College Music Classes”, unpublished doctoral dissertation, The Ohio State University, 1959.
