TY  - BOOK
AU  - Glaser Robert
AU  - Lumsdaine A A
TI  - Teaching machines and programmed learning: a source book
U1  - 371.33 
PY  - 1961///
CY  - Wachington
PB  - National education association
KW  - Audio-visual teaching aids
KW  - Progammed learning
ER  -