TY  - BOOK
AU  - Hughes, J. L.
TI  - Programed learning: a critical evaluation 
U1  - 371.321 
PY  - 0000///n. d
CY  - London
PB  - Sir Isaac Pitman & Sons Ltd
KW  - Programmed instruction
N1  - A publication of the Foundation for Research on Human Behavior
ER  -