TY  - BOOK
AU  - De Cecco,John P.
TI  - Educational technology: Readings in programmed instruction 
U1  - 371.3944082 
PY  - 1964///]
CY  - New York
PB  - Holt, Rinehart and Winston
KW  - Educational technology
N1  - Includes bibliogr. references
ER  -