(1962). The use of programed instruction in U.S. schools: Report of a survey of the use of programed instructional materials in the public schools of the United States during the year 1961-62. / compiled and produced by Research Division, Center for Programed Instruction, in cooperation with the U.S. Dept. of Health, Education, and Welfare, Office of Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)The Use of Programed Instruction in U.S. Schools: Report of a Survey of the Use of Programed Instructional Materials in the Public Schools of the United States During the Year 1961-62. / Compiled and Produced by Research Division, Center for Programed Instruction, in Cooperation with the U.S. Dept. of Health, Education, and Welfare, Office of Education. 1962.
Παραπομπή σε μορφή MLA (9th εκδ.)The Use of Programed Instruction in U.S. Schools: Report of a Survey of the Use of Programed Instructional Materials in the Public Schools of the United States During the Year 1961-62. / Compiled and Produced by Research Division, Center for Programed Instruction, in Cooperation with the U.S. Dept. of Health, Education, and Welfare, Office of Education. 1962.