TY  - BOOK
AU  - Leedham,John
AU  - Unwin,Derick
ED  - Longman & Co.
TI  - Programmed learning in the schools
T2  - Education today
SN  - 0582320917
U1  - 371.3944 23
PY  - 1971///.
CY  - London: 
PB  - Longman, 
KW  - Programmed instruction
N1  - Includes bibliography: p. 133-134 and index
ER  -