TY  - BOOK
AU  - Dunn, W R (Ed.)
AU  - Holroyd, C (Ed.)
TI  - Programmed learning and educational technology
PY  - 1969///
CY  - London: 
PB  - Methuen & Co Ltd, 
KW  - Proceedings
N1  - Vol. 2 Aspects of educational technology
ER  -